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Oct 7th, 2009
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Multiple "cout"s and "if"s within an If statement

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I'm trying to create a program that takes 2 numbers from a user (a numerator and a denominator), displays one ontop of the other separated by dashes, and then shows the answer of one number divided by the other.
Inside an If statement, I want to output several lines using multiple cout statements, along with using an embedded if statement, but after the first cout statement, it seems to take me out of the If. What am I doing wrong?

C++ Syntax (Toggle Plain Text)
  1. #include <iostream>
  2. using namespace std;
  3. int main ()
  4.  
  5. {
  6.  
  7. int n1,n2
  8. float n3
  9.  
  10. cout << "Enter the numerator: "
  11. cin >> n1
  12. cout << "Enter the denominator: "
  13. cin >> n2
  14.  
  15. if ((n1 <10) && (n2 <10))
  16. cout << "You want to see:" << endl;
  17. cout << "" << endl;
  18. cout << "         " << n1 << endl;
  19. cout << "         -" << endl;
  20. cout << "         " << n2 << endl;
  21. cout << " " << endl;
  22. n3 = (n1 / n2) * 1.0000
  23. if (n3 < 10)
  24. cout << "       " << n3;
  25. else if ((n3 >= 10) && (n3 < 100))
  26. cout << "      " << n3;
  27. else if ((n3 >= 100) && (n3 <1000))
  28. cout << "     " << n3
  29.  
  30. else if ((n1 >= 10) && (n1 <100) && (n2 <100))
  31. cout << "You want to see:" << endl;
  32. cout << "" << endl;
  33. cout << "         " << n1 << endl;
  34. cout << "         --" << endl;
  35. cout << "         " << n2 << endl;
  36. cout << " " << endl;
  37. n3 = (n1 / n2) * 1.0000
  38. if (n3 < 10)
  39. cout << "       " << n3;
  40. else if ((n3 >= 10) && (n3 < 100))
  41. cout << "      " << n3;
  42. else if ((n3 >= 100) && (n3 <1000))
  43. cout << "     " << n3
  44.  
  45. else if ((n2 >= 10) && (n2 <100) && (n1 <100))
  46. cout << "You want to see:" << endl;
  47. cout << "" << endl;
  48. cout << "         " << n1 << endl;
  49. cout << "         --" << endl;
  50. cout << "         " << n2 << endl;
  51. cout << " " << endl;
  52. n3 = (n1 / n2) * 1.0000
  53. if (n3 < 10)
  54. cout << "       " << n3;
  55. else if ((n3 >= 10) && (n3 < 100))
  56. cout << "      " << n3;
  57. else if ((n3 >= 100) && (n3 <1000))
  58. cout << "     " << n3
  59.  
  60. else if (n1 >= 100)
  61. cout << "You want to see:" << endl;
  62. cout << "" << endl;
  63. cout << "         " << n1 << endl;
  64. cout << "         ---" << endl;
  65. cout << "         " << n2 << endl;
  66. cout << " " << endl;
  67. n3 = (n1 / n2) * 1.0000
  68. if (n3 < 10)
  69. cout << "       " << n3;
  70. else if ((n3 >= 10) && (n3 < 100))
  71. cout << "      " << n3;
  72. else if ((n3 >= 100) && (n3 <1000))
  73. cout << "     " << n3
  74.  
  75. else if (n2 >= 100)
  76. cout << "You want to see:" << endl;
  77. cout << "" << endl;
  78. cout << "         " << n1 << endl;
  79. cout << "         ---" << endl;
  80. cout << "         " << n2 << endl;
  81. cout << " " << endl;
  82. n3 = (n1 / n2) * 1.0000;
  83. if (n3 < 10)
  84. cout << "       " << n3;
  85. else if ((n3 >= 10) && (n3 < 100))
  86. cout << "      " << n3;
  87. else if ((n3 >= 100) && (n3 <1000))
  88. cout << "     " << n3
  89.  
  90. }
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Light Poster
Towely is offline Offline
40 posts
since Sep 2009
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Oct 7th, 2009
0
Re: Multiple "cout"s and "if"s within an If statement
see the syntax of "if" statement in C.

u r doing

C++ Syntax (Toggle Plain Text)
  1. if(condition)
  2.    statement;
  3.    statement;
which is actually
C++ Syntax (Toggle Plain Text)
  1. if(condition)
  2.    statement;/*will execute depending on the condition*/
  3. statement;/*will always execute*/

do it as
C++ Syntax (Toggle Plain Text)
  1. if(condition)
  2. {
  3.    statement;
  4.    statement;
  5. }/*use curly brace*/
Reputation Points: 121
Solved Threads: 61
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dkalita is offline Offline
402 posts
since Sep 2009
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Oct 7th, 2009
1
Re: Multiple "cout"s and "if"s within an If statement
To put dkalitas point a little more succinctly:
If you want to execute several statements under an if() statement, then you should enclose them with curly braces '{}'.
e.g.
C++ Syntax (Toggle Plain Text)
  1. if(condition)
  2. {
  3.     doSomething();
  4.     something = something_else;
  5. }
  6. else
  7. {
  8.     foo=bar;
  9.     bar=another_thing;
  10. }

If you only want to use one statement under an if, then you don't need to use the braces...Braces are optional in that case!
e.g.
C++ Syntax (Toggle Plain Text)
  1. if (condition)
  2.      doSomething();
  3. else
  4.     something = something_else;

or perhaps
C++ Syntax (Toggle Plain Text)
  1. if(condition)
  2.     doSomething();
  3.  
  4. foo = bar;
  5. bar = something;
  6.  
  7. if(foo==bar)
  8.     doSomethingElse();

So in your code, because you haven't used any braces under any of your if() statements; The first statement under the if() will only get executed if the if statements condition is met...All subsequent statements will be executed regardless of the result of the if statement. (see dkalita's 2nd snippet. That's how the compiler will interpret your code without the braces!)

Cheers for now,
Jas.
Reputation Points: 590
Solved Threads: 123
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JasonHippy is offline Offline
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since Jan 2009
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Oct 7th, 2009
0
Re: Multiple "cout"s and "if"s within an If statement
Thanks for the replies!
I've added in the brackets; I did it in Programmer's Notepad so I made sure I did all of them absolutely right.
But, when I tried to compile the program with g++, (In Unix) I got this error:

"error: expected unqualified-id before else"

I went through the code several times over, and can't quite figure out. Where is the error coming from?

C++ Syntax (Toggle Plain Text)
  1. int main ()
  2.  
  3. {
  4.  
  5. int n1,n2
  6. float n3
  7.  
  8. cout << "Enter the numerator: "
  9. cin >> n1
  10. cout << "Enter the denominator: "
  11. cin >> n2
  12.  
  13. if ((n1 <10) && (n2 <10))
  14. {
  15. cout << "You want to see:" << endl;
  16. cout << "" << endl;
  17. cout << "         " << n1 << endl;
  18. cout << "         -" << endl;
  19. cout << "         " << n2 << endl;
  20. cout << " " << endl;
  21.  
  22. n3 = (n1 / n2) * 1.0000;
  23. if (n3 < 10)
  24. {
  25. cout << "       " << n3;
  26. }
  27. else 
  28. {
  29. if 
  30. ((n3 >= 10) && (n3 < 100))
  31. {
  32. cout << "      " << n3;
  33. }
  34. }
  35. else 
  36. {
  37. if ((n3 >= 100) && (n3 <1000))
  38. {
  39. cout << "     " << n3;
  40. }
  41. }
  42. }
  43.  
  44. // ------------------------------------------------
  45.  
  46.  
  47. else 
  48. {
  49. if ((n1 >= 10) && (n1 <100) && (n2 <100))
  50. {
  51. cout << "You want to see:" << endl;
  52. cout << "" << endl;
  53. cout << "         " << n1 << endl;
  54. cout << "         --" << endl;
  55. cout << "         " << n2 << endl;
  56. cout << " " << endl;
  57.  
  58. n3 = (n1 / n2) * 1.0000;
  59. if (n3 < 10)
  60. {
  61. cout << "       " << n3;
  62. }
  63. else 
  64. {
  65. if 
  66. ((n3 >= 10) && (n3 < 100))
  67. {
  68. cout << "      " << n3;
  69. }
  70. }
  71. else 
  72. {
  73. if ((n3 >= 100) && (n3 <1000))
  74. {
  75. cout << "     " << n3;
  76. }
  77. }
  78. }
  79. }
  80.  
  81. // -------------------------------------------
  82.  
  83.  
  84. else 
  85. {
  86. if ((n2 >= 10) && (n2 <100) && (n1 <100))
  87. {
  88. cout << "You want to see:" << endl;
  89. cout << "" << endl;
  90. cout << "         " << n1 << endl;
  91. cout << "         --" << endl;
  92. cout << "         " << n2 << endl;
  93. cout << " " << endl;
  94.  
  95. n3 = (n1 / n2) * 1.0000;
  96. if (n3 < 10)
  97. {
  98. cout << "       " << n3;
  99. }
  100. else 
  101. {
  102. if 
  103. ((n3 >= 10) && (n3 < 100))
  104. {
  105. cout << "      " << n3;
  106. }
  107. }
  108. else 
  109. {
  110. if ((n3 >= 100) && (n3 <1000))
  111. {
  112. cout << "     " << n3;
  113. }
  114. }
  115. }
  116. }
  117.  
  118. // -----------------------------
  119.  
  120. else 
  121. {
  122. if (n1 >= 100)
  123. {
  124. cout << "You want to see:" << endl;
  125. cout << "" << endl;
  126. cout << "         " << n1 << endl;
  127. cout << "         ---" << endl;
  128. cout << "         " << n2 << endl;
  129. cout << " " << endl;
  130.  
  131. n3 = (n1 / n2) * 1.0000;
  132. if (n3 < 10)
  133. {
  134. cout << "       " << n3;
  135. }
  136. else 
  137. {
  138. if 
  139. ((n3 >= 10) && (n3 < 100))
  140. {
  141. cout << "      " << n3;
  142. }
  143. }
  144. else 
  145. {
  146. if ((n3 >= 100) && (n3 <1000))
  147. {
  148. cout << "     " << n3;
  149. }
  150. }
  151. }
  152. }
  153.  
  154. // ---------------------------------------
  155.  
  156. else
  157. {
  158.  if (n2 >= 100)
  159. {
  160. cout << "You want to see:" << endl;
  161. cout << "" << endl;
  162. cout << "         " << n1 << endl;
  163. cout << "         ---" << endl;
  164. cout << "         " << n2 << endl;
  165. cout << " " << endl;
  166.  
  167. n3 = (n1 / n2) * 1.0000;
  168. if (n3 < 10)
  169. {
  170. cout << "       " << n3;
  171. }
  172. else 
  173. {
  174. if 
  175. ((n3 >= 10) && (n3 < 100))
  176. {
  177. cout << "      " << n3;
  178. }
  179. }
  180. else 
  181. {
  182. if ((n3 >= 100) && (n3 <1000))
  183. {
  184. cout << "     " << n3;
  185. }
  186. }
  187. }
  188. }
  189.  
  190.  
  191. }
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Light Poster
Towely is offline Offline
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Oct 7th, 2009
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Re: Multiple "cout"s and "if"s within an If statement
Click to Expand / Collapse  Quote originally posted by Towely ...
I've added in the brackets; I did it in Programmer's Notepad so I made sure I did all of them absolutely right.
Nope. You didn't get all of them. And you're missing semicolons on a number of statements as well.
Team Colleague
Reputation Points: 2780
Solved Threads: 312
long time no c
Dave Sinkula is offline Offline
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Re: Multiple "cout"s and "if"s within an If statement
Click to Expand / Collapse  Quote originally posted by Dave Sinkula ...
Nope. You didn't get all of them. And you're missing semicolons on a number of statements as well.
I'm 100% positive I got all of the brackets... I quadruple checked. If I am missing one, could you point out where?

Where am I missing semicolons? Could you just point out one place so I know what I'm doing wrong?

This assignment is due in 4 hours, so any quick replies would be appreciated.
Reputation Points: 10
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Towely is offline Offline
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Re: Multiple "cout"s and "if"s within an If statement
Look at your posts above with code. Lines 5, 6, 8, 9, 10, 11. All missing semi colons.
Reputation Points: 10
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wyett is offline Offline
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Re: Multiple "cout"s and "if"s within an If statement
Oh, Thank you for pointing that out, Wyett! That was my old code; I copied and pasted the wrong thing.
Here's the actual code that is giving me the error message:

C++ Syntax (Toggle Plain Text)
  1. #include <iostream>
  2. #include <iomanip>
  3. using namespace std;
  4. int main ()
  5. {
  6.     double  n1,n2,n3;
  7.  
  8.    cout << "Enter the numerator: ";
  9.    cin >> n1;
  10.    cout << "Enter the denominator: ";
  11.    cin >> n2;
  12. if ((n1 <10) && (n2 <10))
  13. {
  14. cout << "You want to see:" << endl;
  15. cout << "" << endl;
  16. cout << "         " << n1 << endl;
  17. cout << "         -" << endl;
  18. cout << "         " << n2 << endl;
  19. cout << " " << endl;
  20.  
  21. n3 = (n1 / n2) * 1.0000;
  22. if (n3 < 10)
  23. {
  24. cout << "       " << n3;
  25. }
  26. else 
  27. {
  28. if 
  29. ((n3 >= 10) && (n3 < 100))
  30. {
  31. cout << "      " << n3;
  32. }
  33. }
  34. else 
  35. {
  36. if ((n3 >= 100) && (n3 <1000))
  37. {
  38. cout << "     " << n3;
  39. }
  40. }
  41. }
  42.  
  43. // ------------------------------------------------
  44.  
  45.  
  46. else 
  47. {
  48. if ((n1 >= 10) && (n1 <100) && (n2 <100))
  49. {
  50. cout << "You want to see:" << endl;
  51. cout << "" << endl;
  52. cout << "         " << n1 << endl;
  53. cout << "         --" << endl;
  54. cout << "         " << n2 << endl;
  55. cout << " " << endl;
  56.  
  57. n3 = (n1 / n2) * 1.0000;
  58. if (n3 < 10)
  59. {
  60. cout << "       " << n3;
  61. }
  62. else 
  63. {
  64. if 
  65. ((n3 >= 10) && (n3 < 100))
  66. {
  67. cout << "      " << n3;
  68. }
  69. }
  70. else 
  71. {
  72. if ((n3 >= 100) && (n3 <1000))
  73. {
  74. cout << "     " << n3;
  75. }
  76. }
  77. }
  78. }
  79.  
  80. // -------------------------------------------
  81.  
  82.  
  83. else 
  84. {
  85. if ((n2 >= 10) && (n2 <100) && (n1 <100))
  86. {
  87. cout << "You want to see:" << endl;
  88. cout << "" << endl;
  89. cout << "         " << n1 << endl;
  90. cout << "         --" << endl;
  91. cout << "         " << n2 << endl;
  92. cout << " " << endl;
  93.  
  94. n3 = (n1 / n2) * 1.0000;
  95. if (n3 < 10)
  96. {
  97. cout << "       " << n3;
  98. }
  99. else 
  100. {
  101. if 
  102. ((n3 >= 10) && (n3 < 100))
  103. {
  104. cout << "      " << n3;
  105. }
  106. }
  107. else 
  108. {
  109. if ((n3 >= 100) && (n3 <1000))
  110. {
  111. cout << "     " << n3;
  112. }
  113. }
  114. }
  115. }
  116.  
  117. // -----------------------------
  118.  
  119. else 
  120. {
  121. if (n1 >= 100)
  122. {
  123. cout << "You want to see:" << endl;
  124. cout << "" << endl;
  125. cout << "         " << n1 << endl;
  126. cout << "         ---" << endl;
  127. cout << "         " << n2 << endl;
  128. cout << " " << endl;
  129.  
  130. n3 = (n1 / n2) * 1.0000;
  131. if (n3 < 10)
  132. {
  133. cout << "       " << n3;
  134. }
  135. else 
  136. {
  137. if 
  138. ((n3 >= 10) && (n3 < 100))
  139. {
  140. cout << "      " << n3;
  141. }
  142. }
  143. else 
  144. {
  145. if ((n3 >= 100) && (n3 <1000))
  146. {
  147. cout << "     " << n3;
  148. }
  149. }
  150. }
  151. }
  152.  
  153. // ---------------------------------------
  154.  
  155. else
  156. {
  157.  if (n2 >= 100)
  158. {
  159. cout << "You want to see:" << endl;
  160. cout << "" << endl;
  161. cout << "         " << n1 << endl;
  162. cout << "         ---" << endl;
  163. cout << "         " << n2 << endl;
  164. cout << " " << endl;
  165.  
  166. n3 = (n1 / n2) * 1.0000;
  167. if (n3 < 10)
  168. {
  169. cout << "       " << n3;
  170. }
  171. else 
  172. {
  173. if 
  174. ((n3 >= 10) && (n3 < 100))
  175. {
  176. cout << "      " << n3;
  177. }
  178. }
  179. else 
  180. {
  181. if ((n3 >= 100) && (n3 <1000))
  182. {
  183. cout << "     " << n3;
  184. }
  185. }
  186. }
  187. }
  188.  
  189.  
  190. }
Last edited by Towely; Oct 7th, 2009 at 10:54 pm.
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Solved Threads: 0
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Towely is offline Offline
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Re: Multiple "cout"s and "if"s within an If statement
Click to Expand / Collapse  Quote originally posted by Towely ...
I'm 100% positive I got all of the brackets... I quadruple checked. If I am missing one, could you point out where?
My beautifier gave up where the indentation stops:
C++ Syntax (Toggle Plain Text)
  1. #include <iostream>
  2. #include <iomanip>
  3. using namespace std;
  4. int main ()
  5. {
  6.    double  n1,n2,n3;
  7.  
  8.    cout << "Enter the numerator: ";
  9.    cin >> n1;
  10.    cout << "Enter the denominator: ";
  11.    cin >> n2;
  12.    if ( (n1 <10) && (n2 <10) )
  13.    {
  14.       cout << "You want to see:" << endl;
  15.       cout << "" << endl;
  16.       cout << "         " << n1 << endl;
  17.       cout << "         -" << endl;
  18.       cout << "         " << n2 << endl;
  19.       cout << " " << endl;
  20.  
  21.       n3 = (n1 / n2) * 1.0000;
  22.       if ( n3 < 10 )
  23.       {
  24.          cout << "       " << n3;
  25.       }
  26.       else
  27.       {
  28.          if
  29.              ( (n3 >= 10) && (n3 < 100) )
  30.          {
  31.             cout << "      " << n3;
  32.          }
  33.       }
  34. else 
  35. {
  36. if ((n3 >= 100) && (n3 <1000))
  37. {
  38. cout << "     " << n3;
  39. }
  40. }
  41. }
  42.  
  43. // ------------------------------------------------
  44.  
  45.  
  46. else 
  47. {
  48. if ((n1 >= 10) && (n1 <100) && (n2 <100))
  49. {
  50. cout << "You want to see:" << endl;
  51. cout << "" << endl;
  52. cout << "         " << n1 << endl;
  53. cout << "         --" << endl;
  54. cout << "         " << n2 << endl;
  55. cout << " " << endl;
  56.  
  57. n3 = (n1 / n2) * 1.0000;
  58. if (n3 < 10)
  59. {
  60. cout << "       " << n3;
  61. }
  62. else 
  63. {
  64. if 
  65. ((n3 >= 10) && (n3 < 100))
  66. {
  67. cout << "      " << n3;
  68. }
  69. }
  70. else 
  71. {
  72. if ((n3 >= 100) && (n3 <1000))
  73. {
  74. cout << "     " << n3;
  75. }
  76. }
  77. }
  78. }
  79.  
  80. // -------------------------------------------
  81.  
  82.  
  83. else 
  84. {
  85. if ((n2 >= 10) && (n2 <100) && (n1 <100))
  86. {
  87. cout << "You want to see:" << endl;
  88. cout << "" << endl;
  89. cout << "         " << n1 << endl;
  90. cout << "         --" << endl;
  91. cout << "         " << n2 << endl;
  92. cout << " " << endl;
  93.  
  94. n3 = (n1 / n2) * 1.0000;
  95. if (n3 < 10)
  96. {
  97. cout << "       " << n3;
  98. }
  99. else 
  100. {
  101. if 
  102. ((n3 >= 10) && (n3 < 100))
  103. {
  104. cout << "      " << n3;
  105. }
  106. }
  107. else 
  108. {
  109. if ((n3 >= 100) && (n3 <1000))
  110. {
  111. cout << "     " << n3;
  112. }
  113. }
  114. }
  115. }
  116.  
  117. // -----------------------------
  118.  
  119. else 
  120. {
  121. if (n1 >= 100)
  122. {
  123. cout << "You want to see:" << endl;
  124. cout << "" << endl;
  125. cout << "         " << n1 << endl;
  126. cout << "         ---" << endl;
  127. cout << "         " << n2 << endl;
  128. cout << " " << endl;
  129.  
  130. n3 = (n1 / n2) * 1.0000;
  131. if (n3 < 10)
  132. {
  133. cout << "       " << n3;
  134. }
  135. else 
  136. {
  137. if 
  138. ((n3 >= 10) && (n3 < 100))
  139. {
  140. cout << "      " << n3;
  141. }
  142. }
  143. else 
  144. {
  145. if ((n3 >= 100) && (n3 <1000))
  146. {
  147. cout << "     " << n3;
  148. }
  149. }
  150. }
  151. }
  152.  
  153. // ---------------------------------------
  154.  
  155. else
  156. {
  157.  if (n2 >= 100)
  158. {
  159. cout << "You want to see:" << endl;
  160. cout << "" << endl;
  161. cout << "         " << n1 << endl;
  162. cout << "         ---" << endl;
  163. cout << "         " << n2 << endl;
  164. cout << " " << endl;
  165.  
  166. n3 = (n1 / n2) * 1.0000;
  167. if (n3 < 10)
  168. {
  169. cout << "       " << n3;
  170. }
  171. else 
  172. {
  173. if 
  174. ((n3 >= 10) && (n3 < 100))
  175. {
  176. cout << "      " << n3;
  177. }
  178. }
  179. else 
  180. {
  181. if ((n3 >= 100) && (n3 <1000))
  182. {
  183. cout << "     " << n3;
  184. }
  185. }
  186. }
  187. }
  188.  
  189.  
  190. }
Last edited by Dave Sinkula; Oct 7th, 2009 at 11:15 pm.
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Dave Sinkula is offline Offline
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Oct 7th, 2009
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Re: Multiple "cout"s and "if"s within an If statement
Click to Expand / Collapse  Quote originally posted by Dave Sinkula ...
My beautifier gave up where the indentation stops:
Forgive my ignorance, does that mean that is where the error is?
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Towely is offline Offline
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since Sep 2009

This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.
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