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Problem with Switch statement ?

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Problem with Switch statement ?

 
0
  #1
Aug 10th, 2005
Hello all :p

I was working on this simple program with a formula for
calculating parallel resistance. I was getting all kinds
of errors at first but I am still getting these few.

Compiling...
ResistancePar.cpp
G:\VC++60\ResistancePar\ResistancePar.cpp(5) : warning C4518: 'float ' : storage-class or type specifier(s) unexpected here; ignored
G:\VC++60\ResistancePar\ResistancePar.cpp(5) : error C2146: syntax error : missing ';' before identifier 'RPar'
G:\VC++60\ResistancePar\ResistancePar.cpp(5) : fatal error C1004: unexpected end of file found
Error executing cl.exe.

ResistancePar.obj - 2 error(s), 1 warning(s)

C++ Syntax (Toggle Plain Text) 
  1.  
  2. #include <iostream>
  3. using namespace std;
  4. int main (void)
  5.  
  6. float RPar, Rone, Rtwo, Rthree, Rfour, Rfive, Rsix;
  7.  
  8. {
  9. char quantity;	
  10.  
  11. cout << "Enter the quantity of resistors" << endl;
  12. cout << "A maximum of 6 resistors please" << endl;
  13. cin >> quantity;
  14. switch (quantity)
  15.  
  16. {
  17. case '1':
  18. cout << " You must enter at least 2";
  19. break;
  20. case '2':
  21. 	cout << " Enter the value of the first resistor";
  22. 	cin >> Rone;
  23. 	cout << " Enter the value of the second resistor";
  24. 	cin >> "Rtwo;
  25. 	Rpar = (Rone * Rtwo) / (Rone + Rtwo);
  26.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  27. break;
  28. case '3':
  29. 	cout << " Enter the value of the first resistor";
  30. 	cin >> Rone;
  31. 	cout << " Enter the value of the second resistor";
  32. 	cin >> "Rtwo;
  33. 	cout << " Enter the value of the third resistor";
  34. 	cin >> "Rthree;
  35. 	Rpar = (Rone * Rtwo * Rthree) / (Rone + Rtwo + Rthree);
  36.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  37. break;
  38. case '4':
  39. 	cout << " Enter the value of the first resistor";
  40. 	cin >> Rone;
  41. 	cout << " Enter the value of the second resistor";
  42. 	cin >> "Rtwo;
  43. 	cout << " Enter the value of the third resistor";
  44. 	cin >> "Rthree;
  45. 	cout << " Enter the value of the fouth resistor";
  46. 	cin >> "Rfour;
  47. 	Rpar = (Rone * Rtwo * Rthree * Rfour) / (Rone + Rtwo + Rthree + Rfour);
  48.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  49. break;
  50. case '5':
  51. 	cout << " Enter the value of the first resistor";
  52. 	cin >> Rone;
  53. 	cout << " Enter the value of the second resistor";
  54. 	cin >> "Rtwo;
  55. 	cout << " Enter the value of the third resistor";
  56. 	cin >> "Rthree;
  57. 	cout << " Enter the value of the fouth resistor";
  58. 	cin >> "Rfour;
  59. 	cout << " Enter the value of the fifth resistor";
  60. 	cin >> "Rfive;
  61. 	Rpar = (Rone * Rtwo * Rthree * Rfour * Rfive) / (Rone + Rtwo + Rthree + Rfour + Rfive);
  62.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  63. break;
  64. case '6':
  65. 	cout << " Enter the value of the first resistor";
  66. 	cin >> Rone;
  67. 	cout << " Enter the value of the second resistor";
  68. 	cin >> "Rtwo;
  69. 	cout << " Enter the value of the third resistor";
  70. 	cin >> "Rthree;
  71. 	cout << " Enter the value of the fouth resistor";
  72. 	cin >> "Rfour;
  73. 	cout << " Enter the value of the fifth resistor";
  74. 	cin >> "Rfive;
  75. 	cout << " Enter the value of the sixth resistor";
  76. 	cin >> "Rsix;
  77. 	Rpar = (Rone * Rtwo * Rthree * Rfour * Rfive * Rsix) / (Rone + Rtwo + Rthree + Rfour + Rfive + Rsix);
  78.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  79.  
  80.  
  81. }
  82. return 0;
  83. }
  84.  


Any help would be appreciated.

Thanks, BandM
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Re: Problem with Switch statement ?

 
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  #2
Aug 10th, 2005
try changing the

int main (void) ...

to int main () {

should read like this

int main () {

float ......

and no { here.
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Re: Problem with Switch statement ?

 
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  #3
Aug 10th, 2005
Also,
You should probably make quantity an 'int', and then in your switch, it would be: (Note no ' ' around the number)

case 1:
cout << " You must enter at least 2";
break;
case 2:
cout << " Enter the value of the first resistor";
..etc..

Also, you should put a default case case...

default:
cout<<"In valid number:"<<quantity<<endl;
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Re: Problem with Switch statement ?

 
0
  #4
Aug 10th, 2005
I tried that and I still got some errors

I changed it ti this:

C++ Syntax (Toggle Plain Text) 
  1.  
  2. #include <iostream>
  3. #include <cmath>
  4. using namespace std;
  5. int main()
  6.  
  7.  
  8. ;float RPar, Rone, Rtwo, Rthree, Rfour, Rfive, Rsix;
  9. char quantity;
  10. {
  11.  
  12.  
  13.  
  14. cout << "Enter the quantity of resistors" << endl;
  15. cout << "A maximum of 6 resistors please" << endl;
  16. cin >> quantity;
  17. switch (quantity)
  18.  
  19.  
  20. case '1':
  21. cout << " You must enter at least 2";
  22. break;
  23. case '2':
  24. 	cout << " Enter the value of the first resistor";
  25. 	cin >> Rone;
  26. 	cout << " Enter the value of the second resistor";
  27. 	cin >> Rtwo;
  28. 	Rpar = (Rone * Rtwo) / (Rone + Rtwo);
  29.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  30. break;
  31. case '3':
  32. 	cout << " Enter the value of the first resistor";
  33. 	cin >> Rone;
  34. 	cout << " Enter the value of the second resistor";
  35. 	cin >> Rtwo;
  36. 	cout << " Enter the value of the third resistor";
  37. 	cin >> Rthree;
  38. 	Rpar = (Rone * Rtwo * Rthree) / (Rone + Rtwo + Rthree);
  39.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  40. break;
  41. case '4':
  42. 	cout << " Enter the value of the first resistor";
  43. 	cin >> Rone;
  44. 	cout << " Enter the value of the second resistor";
  45. 	cin >> Rtwo;
  46. 	cout << " Enter the value of the third resistor";
  47. 	cin >> Rthree;
  48. 	cout << " Enter the value of the fouth resistor";
  49. 	cin >> Rfour;
  50. 	Rpar = (Rone * Rtwo * Rthree * Rfour) / (Rone + Rtwo + Rthree + Rfour);
  51.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  52. break;
  53. case '5':
  54. 	cout << " Enter the value of the first resistor";
  55. 	cin >> Rone;
  56. 	cout << " Enter the value of the second resistor";
  57. 	cin >> Rtwo;
  58. 	cout << " Enter the value of the third resistor";
  59. 	cin >> Rthree;
  60. 	cout << " Enter the value of the fouth resistor";
  61. 	cin >> Rfour;
  62. 	cout << " Enter the value of the fifth resistor";
  63. 	cin >> Rfive;
  64. 	Rpar = (Rone * Rtwo * Rthree * Rfour * Rfive) / (Rone + Rtwo + Rthree + Rfour + Rfive);
  65.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  66. break;
  67. case '6':
  68. 	cout << " Enter the value of the first resistor";
  69. 	cin >> Rone;
  70. 	cout << " Enter the value of the second resistor";
  71. 	cin >> Rtwo;
  72. 	cout << " Enter the value of the third resistor";
  73. 	cin >> Rthree;
  74. 	cout << " Enter the value of the fouth resistor";
  75. 	cin >> Rfour;
  76. 	cout << " Enter the value of the fifth resistor";
  77. 	cin >> Rfive;
  78. 	cout << " Enter the value of the sixth resistor";
  79. 	cin >> Rsix;
  80. 	Rpar = (Rone * Rtwo * Rthree * Rfour * Rfive * Rsix) / (Rone + Rtwo + Rthree + Rfour + Rfive + Rsix);
  81.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  82.  
  83.  
  84.  
  85. return 0;
  86. }

Now I am just getting this:

Compiling...
ResistancePar.cpp
G:\VC++60\ResistancePar\ResistancePar.cpp(9) : error C2447: missing function header (old-style formal list?)
Error executing cl.exe.

ResistancePar.obj - 1 error(s), 0 warning(s)





Thanks BandM
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Re: Problem with Switch statement ?

 
0
  #5
Aug 10th, 2005
Move this:
float RPar, Rone, Rtwo, Rthree, Rfour, Rfive, Rsix;

to be above int main()

Move this:
char quantity;

to be after:
int main()
{
char quantity;

Also after switch( quantity), you need a { and after all of the case logic you need another }
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Re: Problem with Switch statement ?

 
0
  #6
Aug 11th, 2005
Well, I have gotten down to one error.
missing function header.
Anyone have any ideas?

C++ Syntax (Toggle Plain Text) 
  1.  
  2. #include <iostream>
  3. #include <cmath>
  4. using namespace std;
  5. int main()
  6.  
  7. ;float RPar, Rone, Rtwo, Rthree, Rfour, Rfive, Rsix;
  8. int quantity;
  9.  
  10. {
  11.  
  12.  
  13.  
  14. cout << "Enter the quantity of resistors" << endl;
  15. cout << "A maximum of 6 resistors please" << endl;
  16. cin >> quantity;
  17. switch (quantity)
  18.  
  19.  
  20. case 1:
  21. cout << " You must enter at least 2";
  22. break;
  23. case '2':
  24. 	cout << " Enter the value of the first resistor";
  25. 	cin >> Rone;
  26. 	cout << " Enter the value of the second resistor";
  27. 	cin >> Rtwo;
  28. 	Rpar = (Rone * Rtwo) / (Rone + Rtwo);
  29.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  30. break;
  31. case 3:
  32. 	cout << " Enter the value of the first resistor";
  33. 	cin >> Rone;
  34. 	cout << " Enter the value of the second resistor";
  35. 	cin >> Rtwo;
  36. 	cout << " Enter the value of the third resistor";
  37. 	cin >> Rthree;
  38. 	Rpar = (Rone * Rtwo * Rthree) / (Rone + Rtwo + Rthree);
  39.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  40. break;
  41. case 4:
  42. 	cout << " Enter the value of the first resistor";
  43. 	cin >> Rone;
  44. 	cout << " Enter the value of the second resistor";
  45. 	cin >> Rtwo;
  46. 	cout << " Enter the value of the third resistor";
  47. 	cin >> Rthree;
  48. 	cout << " Enter the value of the fouth resistor";
  49. 	cin >> Rfour;
  50. 	Rpar = (Rone * Rtwo * Rthree * Rfour) / (Rone + Rtwo + Rthree + Rfour);
  51.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  52. break;
  53. case 5:
  54. 	cout << " Enter the value of the first resistor";
  55. 	cin >> Rone;
  56. 	cout << " Enter the value of the second resistor";
  57. 	cin >> Rtwo;
  58. 	cout << " Enter the value of the third resistor";
  59. 	cin >> Rthree;
  60. 	cout << " Enter the value of the fouth resistor";
  61. 	cin >> Rfour;
  62. 	cout << " Enter the value of the fifth resistor";
  63. 	cin >> Rfive;
  64. 	Rpar = (Rone * Rtwo * Rthree * Rfour * Rfive) / (Rone + Rtwo + Rthree + Rfour + Rfive);
  65.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  66. break;
  67. case 6:
  68. 	cout << " Enter the value of the first resistor";
  69. 	cin >> Rone;
  70. 	cout << " Enter the value of the second resistor";
  71. 	cin >> Rtwo;
  72. 	cout << " Enter the value of the third resistor";
  73. 	cin >> Rthree;
  74. 	cout << " Enter the value of the fouth resistor";
  75. 	cin >> Rfour;
  76. 	cout << " Enter the value of the fifth resistor";
  77. 	cin >> Rfive;
  78. 	cout << " Enter the value of the sixth resistor";
  79. 	cin >> Rsix;
  80. 	Rpar = (Rone * Rtwo * Rthree * Rfour * Rfive * Rsix) / (Rone + Rtwo + Rthree + Rfour + Rfive + Rsix);
  81.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  82.  
  83.  
  84.  
  85. return 0;
  86. }

Compiling...
ResistancePar.cpp
G:\VC++60\ResistancePar\ResistancePar.cpp(9) : error C2447: missing function header (old-style formal list?)
Error executing cl.exe.

ResistancePar.obj - 1 error(s), 0 warning(s)


BandM :o
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Re: Problem with Switch statement ?

 
0
  #7
Aug 11th, 2005
This: 
int main()

;float RPar, Rone, Rtwo, Rthree, Rfour, Rfive, Rsix;
int quantity;

{
should be like this: 
int main()
{
   float Rpar, Rone, Rtwo, Rthree, Rfour, Rfive, Rsix;
   int quantity;
Then some more errors that can be fixed by enclosing the statements for the switch within {}. And this: 
   case '2':
should be this:
C++ Syntax (Toggle Plain Text) 
  1.    case 2:
"One of the methods used by statists to destroy capitalism consists in establishing controls that tie a given industry hand and foot, making it unable to solve its problems, then declaring that freedom has failed and stronger controls are necessary." --Ayn Rand
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Re: Problem with Switch statement ?

 
0
  #8
Aug 11th, 2005
OK, I fixed the '2' problem
when I take the ; from in front of float
I get :

Compiling...
ResistancePar.cpp
G:\VC++60\ResistancePar\ResistancePar.cpp(6) : warning C4518: 'float ' : storage-class or type specifier(s) unexpected here; ignored
G:\VC++60\ResistancePar\ResistancePar.cpp(6) : error C2146: syntax error : missing ';' before identifier 'Rpar'
G:\VC++60\ResistancePar\ResistancePar.cpp(6) : fatal error C1004: unexpected end of file found
Error executing cl.exe.

ResistancePar.obj - 2 error(s), 1 warning(s)
Like this:
C++ Syntax (Toggle Plain Text) 
  1.  
  2. #include <iostream>
  3. #include <cmath>
  4. using namespace std;
  5. int main()
  6.  
  7. float Rpar, Rone, Rtwo, Rthree, Rfour, Rfive, Rsix;
  8. int quantity;
  9.  
  10. {
  11.  
  12.  
  13. 	{	
  14. cout << "Enter the quantity of resistors" << endl;
  15. cout << "A maximum of 6 resistors please" << endl;
  16. cin >> quantity;
  17. switch (quantity)
  18. 	}
  19.  
  20. case 1:
  21. cout << " You must enter at least 2";
  22. break;
  23. case 2:
  24. 	cout << " Enter the value of the first resistor";
  25. 	cin >> Rone;
  26. 	cout << " Enter the value of the second resistor";
  27. 	cin >> Rtwo;
  28. 	Rpar = (Rone * Rtwo) / (Rone + Rtwo);
  29.     cout

When I put the ; back in front ;float

I get:

Compiling...
ResistancePar.cpp
G:\VC++60\ResistancePar\ResistancePar.cpp(9) : error C2447: missing function header (old-style formal list?)
Error executing cl.exe.

ResistancePar.obj - 1 error(s), 0 warning(s)
:rolleyes:
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Re: Problem with Switch statement ?

 
0
  #9
Aug 11th, 2005
Three times you've been told not to declare variables between this
C++ Syntax (Toggle Plain Text) 
  1. int main()
and this
C++ Syntax (Toggle Plain Text) 
  1. { // the opening brace of main
Three times you've ignored it. If you implement the suggestions already mentioned in this thread, your errors should be gone.
•
•
•
•
Originally Posted by Dave Sinkula
This: 
int main()

;float RPar, Rone, Rtwo, Rthree, Rfour, Rfive, Rsix;
int quantity;

{
should be like this: 
int main()
{
   float Rpar, Rone, Rtwo, Rthree, Rfour, Rfive, Rsix;
   int quantity;
"One of the methods used by statists to destroy capitalism consists in establishing controls that tie a given industry hand and foot, making it unable to solve its problems, then declaring that freedom has failed and stronger controls are necessary." --Ayn Rand
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Re: Problem with Switch statement ?

 
0
  #10
Aug 11th, 2005
It's not that I ignored it, I tried it and it and got tons more errors than before I tried it.

C++ Syntax (Toggle Plain Text) 
  1.  
  2. #include <iostream>
  3. #include <cmath>
  4. using namespace std;
  5. int main()
  6.  
  7.  
  8.  
  9. {
  10. float Rpar, Rone, Rtwo, Rthree, Rfour, Rfive, Rsix;
  11. int quantity;
  12.  
  13.  
  14. cout << "Enter the quantity of resistors" << endl;
  15. cout << "A maximum of 6 resistors please" << endl;
  16. cin >> quantity;
  17. switch (quantity)
  18.  
  19.  
  20. case 1:
  21. cout << " You must enter at least 2";
  22. break;
  23. case 2:
  24. 	cout << " Enter the value of the first resistor";
  25. 	cin >> Rone;
  26. 	cout << " Enter the value of the second resistor";
  27. 	cin >> Rtwo;
  28. 	Rpar = (Rone * Rtwo) / (Rone + Rtwo);
  29.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  30. break;
  31. case 3:
  32. 	cout << " Enter the value of the first resistor";
  33. 	cin >> Rone;
  34. 	cout << " Enter the value of the second resistor";
  35. 	cin >> Rtwo;
  36. 	cout << " Enter the value of the third resistor";
  37. 	cin >> Rthree;
  38. 	Rpar = (Rone * Rtwo * Rthree) / (Rone + Rtwo + Rthree);
  39.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  40. break;
  41. case 4:
  42. 	cout << " Enter the value of the first resistor";
  43. 	cin >> Rone;
  44. 	cout << " Enter the value of the second resistor";
  45. 	cin >> Rtwo;
  46. 	cout << " Enter the value of the third resistor";
  47. 	cin >> Rthree;
  48. 	cout << " Enter the value of the fouth resistor";
  49. 	cin >> Rfour;
  50. 	Rpar = (Rone * Rtwo * Rthree * Rfour) / (Rone + Rtwo + Rthree + Rfour);
  51.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  52. break;
  53. case 5:
  54. 	cout << " Enter the value of the first resistor";
  55. 	cin >> Rone;
  56. 	cout << " Enter the value of the second resistor";
  57. 	cin >> Rtwo;
  58. 	cout << " Enter the value of the third resistor";
  59. 	cin >> Rthree;
  60. 	cout << " Enter the value of the fouth resistor";
  61. 	cin >> Rfour;
  62. 	cout << " Enter the value of the fifth resistor";
  63. 	cin >> Rfive;
  64. 	Rpar = (Rone * Rtwo * Rthree * Rfour * Rfive) / (Rone + Rtwo + Rthree + Rfour + Rfive);
  65.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  66. break;
  67. case 6:
  68. 	cout << " Enter the value of the first resistor";
  69. 	cin >> Rone;
  70. 	cout << " Enter the value of the second resistor";
  71. 	cin >> Rtwo;
  72. 	cout << " Enter the value of the third resistor";
  73. 	cin >> Rthree;
  74. 	cout << " Enter the value of the fouth resistor";
  75. 	cin >> Rfour;
  76. 	cout << " Enter the value of the fifth resistor";
  77. 	cin >> Rfive;
  78. 	cout << " Enter the value of the sixth resistor";
  79. 	cin >> Rsix;
  80. 	Rpar = (Rone * Rtwo * Rthree * Rfour * Rfive * Rsix) / (Rone + Rtwo + Rthree + Rfour + Rfive + Rsix);
  81.     cout <<"The value of parallel resistance is: " << Rpar << "\n";
  82.  
  83.  
  84.  
  85. return 0;
  86. }
  87.  
  88. Compiling...
  89. ResistancePar.cpp
  90. G:\VC++60\ResistancePar\ResistancePar.cpp(21) : error C2043: illegal break
  91. G:\VC++60\ResistancePar\ResistancePar.cpp(22) : error C2046: illegal case
  92. G:\VC++60\ResistancePar\ResistancePar.cpp(29) : error C2043: illegal break
  93. G:\VC++60\ResistancePar\ResistancePar.cpp(30) : error C2046: illegal case
  94. G:\VC++60\ResistancePar\ResistancePar.cpp(39) : error C2043: illegal break
  95. G:\VC++60\ResistancePar\ResistancePar.cpp(40) : error C2046: illegal case
  96. G:\VC++60\ResistancePar\ResistancePar.cpp(51) : error C2043: illegal break
  97. G:\VC++60\ResistancePar\ResistancePar.cpp(52) : error C2046: illegal case
  98. G:\VC++60\ResistancePar\ResistancePar.cpp(65) : error C2043: illegal break
  99. G:\VC++60\ResistancePar\ResistancePar.cpp(66) : error C2046: illegal case
  100. Error executing cl.exe.
  101.  
  102. ResistancePar.obj - 10 error(s), 0 warning(s)


Doesn't putting the variable outside the brackets just make them global?
I wouldn't think that it should effect anything, then I am just a greenhorn trying to learn.

:mrgreen:
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