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Fraction calculator

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DragonReborn225 DragonReborn225 is offline Offline
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Fraction calculator

 
0
  #1
Oct 22nd, 2008
hey, this program is supposed to calculate fractions, and I feel that I have most of the code down, but I can't get past the

fractions.cpp:50: error: expected primary-expression before 'char'

error, its probably something misicule, but I can't get it for the life of me. The error is in the main function. heres my code. THANK YOU SO MUCH IN ADVANCE!!!

C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4.  
  5. void menu (char symbol);
  6. void addFractions(int& a,int& b,int& c,int& d,int& numerator,int&
  7. denominator);
  8.  
  9. void subtractFractions(int& a,int& b,int& c,int& d,int& numerator,int&
  10. denominator);
  11.  
  12. void multiplyFractions (int& a,int& b,int& c,int& d,int& numerator,int&
  13. denominator);
  14.  
  15. void divideFractions (int& a,int& b,int& c,int& d,int& numerator,int&
  16. denominator);
  17.  
  18. int main()
  19. {
  20. int a, b, c, d;
  21. int numerator;
  22. int denominator;
  23. char symbol;
  24. cout << "first, we will need your numerators/denominators." << endl;
  25. cout << "What is your first fractions numerator?" << endl;
  26. cin>> a;
  27. cout << "What is your first fractions denominator?" << endl;
  28. cin >> b;
  29. cout << "What is your second fractions numerator?" << endl;
  30. cin >> c;
  31. cout << "What is your second fractions denominator?" << endl;
  32. cin >> d;
  33.  
  34. while (d == 0 || b == 0)
  35. {
  36. if (d == 0)
  37. {
  38. cout << "Your second fraction has a 0 in the denominator, what would" << 
  39. " you like to change it to?" << endl;
  40. cin >> d;
  41. }
  42. if (b == 0)
  43. {
  44. cout << "Your first fraction has a 0 in the denominator, what would" << 
  45. " you like to change it to?" << endl;
  46. cin >> b;
  47. }
  48. }
  49.  
  50. menu (char symbol);
  51.  
  52. return 0;
  53. }
  54. void menu(char symbol)
  55. {
  56. int a, b, c, d;
  57. int numerator, denominator;
  58. cout << "Have fractions that need solving??" << endl;
  59. cout << "Well, luckily for you, you chanced upon a fractions calculator" 
  60. << endl;
  61. cout << "First, we will need the operation you wish to perform." << 
  62. endl; 
  63. cout << "choose one of the following: + (addition), - " <<
  64. "(subtraction), * (multiplication), and finally / (division)." << endl;
  65. cin >> symbol;
  66. cout << endl;
  67.  
  68. switch (symbol)
  69. {
  70. case '*':
  71.         multiplyFractions(a,b,c,d,numerator, denominator);
  72.  
  73.         cout << "Answer is " << numerator << "/" << denominator << endl;
  74. break;
  75.  
  76. case '/':
  77.        divideFractions(a,b,c,d,numerator, denominator);
  78.  
  79.  
  80.         cout << "Answer is " << numerator << "/" << denominator << endl;
  81. break;
  82.  
  83. case '+':
  84.        addFractions(a,b,c,d,numerator, denominator);
  85.  
  86.  
  87.         cout << "Answer is " << numerator << "/" << denominator << endl;
  88. break;
  89.  
  90. case '-':
  91.       subtractFractions(a,b,c,d,numerator, denominator);
  92.  
  93.         cout << "Answer is " << numerator << "/" << denominator << endl;
  94. break;
  95.  
  96. default:
  97.         cout << "Invalid input, pay better attention next time." << 
  98. endl;
  99. }
  100. }
  101.  
  102. void addFractions (int& a,int& b,int& c,int& d,int& numerator,int&
  103. denominator)
  104.  
  105. {
  106. int temp;  
  107. temp =  b*d;
  108. numerator = (temp/b*a)+(temp/d*c);
  109. denominator = temp;
  110. }
  111.  
  112. void subtractFractions (int& a,int& b,int& c,int& d,int& numerator,int&
  113. denominator)
  114.  
  115. {
  116. int temp;
  117. temp =  b*d;
  118. numerator = (temp/b*a)-(temp/d*c);
  119. denominator = temp;
  120. } 
  121.  
  122. void multiplyFractions(int& a,int& b,int& c,int& d,int& numerator,int&
  123. denominator)
  124.  
  125. { 
  126. numerator = (a*c); 
  127. denominator = (b*d);
  128. }
  129.  
  130. void divideFractions(int& a,int& b,int& c,int& d,int& numerator,int&  
  131. denominator)
  132. {
  133. numerator = (a*d);
  134. denominator = (b*c);
  135. }
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Re: Fraction calculator

 
0
  #2
Oct 22nd, 2008
menu (char symbol); Should be
menu (symbol);
Chris
Knowledge is power -- But experience is everything
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Re: Fraction calculator

 
0
  #3
Oct 22nd, 2008
You were also missing a bracket here and there
You also didn't need addresses when passing the values of a, b, c and d
You might not want the code but I did it anyway cos it's fun.
C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2. #include <string>
  3.  
  4. using namespace std;
  5.  
  6. void menu(int a, int b, int c, int d, char symbol);
  7.  
  8. void addFractions(int a,int b, int c, int d, int &numerator, int &denominator);
  9.  
  10. void subtractFractions(int a, int b, int c, int d, int &numerator, int &denominator);
  11.  
  12. void multiplyFractions (int a, int b, int c, int d, int &numerator, int &denominator);
  13.  
  14. void divideFractions (int a, int b, int c, int d, int &numerator, int &denominator);
  15.  
  16. //-------------------------------------------------------------------------
  17. int main()
  18. {
  19.   int a, b, c, d;
  20.   int numerator;
  21.   int denominator;
  22.   char symbol;
  23.   cout << "first, we will need your numerators/denominators." << endl;
  24.   cout << "What is your first fractions numerator?" << endl;
  25.   cin>> a;
  26.   cout << "What is your first fractions denominator?" << endl;
  27.   cin >> b;
  28.   cout << "What is your second fractions numerator?" << endl;
  29.   cin >> c;
  30.   cout << "What is your second fractions denominator?" << endl;
  31.   cin >> d;
  32.   while (d == 0 || b == 0)
  33.   {
  34.     if (d == 0)
  35.     {
  36.       cout << "Your second fraction has a 0 in the denominator, what would" <<
  37.               " you like to change it to?" << endl;
  38.       cin >> d;
  39.     }
  40.     if (b == 0)
  41.     {
  42.       cout << "Your first fraction has a 0 in the denominator, what would" <<
  43.               " you like to change it to?" << endl;
  44.       cin >> b;
  45.     }
  46.   }
  47.   menu(a, b, c, d, symbol);
  48.   return 0;
  49. }
  50.  
  51. //--------------------------------------------------------------------
  52.  
  53. void menu(int a, int b, int c, int d, char symbol)
  54. {
  55.   int numerator, denominator;
  56.   cout << "Have fractions that need solving??" << endl;
  57.   cout << "Well, luckily for you, you chanced upon a fractions calculator"
  58.   << endl;
  59.   cout << "First, we will need the operation you wish to perform." <<
  60.   endl;
  61.   cout << "choose one of the following: + (addition), - " <<
  62.   "(subtraction), * (multiplication), and finally / (division)." << endl;
  63.   cin >> symbol;
  64.   cout << endl;
  65.  
  66.   switch (symbol)
  67.   {
  68.   case '*':
  69.     multiplyFractions(a,b,c,d,numerator, denominator);
  70.     cout << "Answer is " << numerator << "/" << denominator << endl;
  71.     system("pause>nul");
  72.     break;
  73.   case '/':
  74.     divideFractions(a,b,c,d,numerator, denominator);
  75.     cout << "Answer is " << numerator << "/" << denominator << endl;
  76.     system("pause>nul");
  77.     break;
  78.   case '+':
  79.     addFractions(a, b, c, d, numerator, denominator);
  80.     cout << "Answer is " << numerator << "/" << denominator << endl;
  81.     system("pause>nul");
  82.     break;
  83.   case '-':
  84.     subtractFractions(a,b,c,d,numerator, denominator);
  85.     cout << "Answer is " << numerator << "/" << denominator << endl;
  86.     system("pause>nul");
  87.     break;
  88.   default:
  89.     cout << "Invalid input, pay better attention next time." << endl;
  90.   }
  91. }
  92.  
  93. void addFractions (int a, int b, int c, int d, int &numerator, int &denominator)
  94. {
  95.   numerator = (a*d) + (b*c);
  96.   denominator = (b*d);
  97. }
  98.  
  99. void subtractFractions (int a, int b, int c, int d, int &numerator, int &denominator)
  100. {
  101.   numerator = (a*d)-(b*c);
  102.   denominator = (b*d);
  103. }
  104.  
  105. void multiplyFractions(int a, int b, int c, int d, int &numerator, int&denominator)
  106. {
  107.   numerator = (a*c);
  108.   denominator = (b*d);
  109. }
  110.  
  111. void divideFractions(int a, int b, int c, int d, int &numerator, int &denominator)
  112. {
  113.   numerator = (a*d);
  114.   denominator = (b*c);
  115. }
Regards..

P.S. Try to tab your statements so it's easier to catch when you're missing brackets.
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