temperature help

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Join Date: Feb 2006
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jlouang jlouang is offline Offline
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temperature help

 
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  #1
May 4th, 2006
can someone help me i can't seem to find my temperature problem



C++ Syntax (Toggle Plain Text) 
  1. /****************************
  2. *    functions
  3. *****************************/
  4. float c2F(float);
  5. float f2C(float);
  6.  
  7. /****************************
  8. *    gloabal variables
  9. *****************************/
  10.  
  11. int main ()
  12. {
  13.     float inTemp;
  14.     float newTemp;
  15.     char inCode;
  16.  
  17.     cout << "please enter the code (a 'C' of 'F'): ";
  18.     cin >> inCode;
  19.  
  20.     cout << "please enter the tempature to be converted: ";
  21.     cin >> inTemp;
  22.  
  23.     if (inCode == 'C')
  24.     {
  25.                newTemp = c2F(inTemp);
  26.                cout << "converted temp is " << newTemp << "\n";
  27.     }
  28.     else if (inCode == 'F')
  29.     {
  30.                newTemp = f2C(inTemp);
  31.                cout << "converted temp is " << newTemp << "\n";
  32.     }
  33.     else
  34.     {
  35.         newTemp = 0;
  36.         cout << "bad code entered\n";
  37.     }
  38.  
  39.     system("pause");
  40.  
  41.     return 0;
  42. }
  43. /****************************
  44. *    converts a temp from F->C using the formula F=5/9(C-32)
  45. *****************************/
  46. float f2C (float inTemp)
  47. {
  48.       float newTemp = 5/9* (inTemp-32);
  49.       return newTemp;
  50. }
  51. /****************************
  52. *    converts a temp from C->F the formula C=9/9(F) +32
  53. *****************************/
  54. float c2F (float inTemp)
  55. {
  56.       float newTemp = 9/5* inTemp+32;
  57.       return newTemp;
  58. }
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Join Date: Feb 2006
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Re: temperature help

 
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  #2
May 4th, 2006
What is the problem ..specify that..and put brackets in the formula to avoid confusion and miscalculation
return 0;
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jlouang jlouang is offline Offline
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Re: temperature help

 
0
  #3
May 4th, 2006
i updated the my code up there again and like when I run it the answer turns out wrong
C++ Syntax (Toggle Plain Text) 
  1. /****************************
  2. *    functions
  3. *****************************/
  4. float c2F(float);
  5. float f2C(float);
  6.  
  7. /****************************
  8. *    gloabal variables
  9. *****************************/
  10.  
  11. int main ()
  12. {
  13.     float inTemp;
  14.     float newTemp;
  15.     char inCode;
  16.  
  17.     cout << "please enter the code (a 'C' of 'F'): ";
  18.     cin >> inCode;
  19.  
  20.     cout << "please enter the tempature to be converted: ";
  21.     cin >> inTemp;
  22.  
  23.     if (inCode == 'C')
  24.     {
  25.                newTemp = c2F(inTemp);
  26.                cout << "converted temp is " << newTemp << "\n";
  27.     }
  28.     else if (inCode == 'F')
  29.     {
  30.                newTemp = f2C(inTemp);
  31.                cout << "converted temp is " << newTemp << "\n";
  32.     }
  33.     else
  34.     {
  35.         newTemp = 0;
  36.         cout << "bad code entered\n";
  37.     }
  38.  
  39.     system("pause");
  40.  
  41.     return 0;
  42. }
  43. /****************************
  44. *    converts a temp from F->C using the formula F=5/9(C-32)
  45. *****************************/
  46. float f2C (float inTemp)
  47. {
  48.       float newTemp = 5/9* (inTemp-32);
  49.       return newTemp;
  50. }
  51. /****************************
  52. *    converts a temp from C->F the formula C=9/9(F) +32
  53. *****************************/
  54. float c2F (float inTemp)
  55. {
  56.       float newTemp = 9/5* inTemp+32;
  57.       return newTemp;
  58. }
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Re: temperature help

 
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  #4
May 4th, 2006
With integer math 9/5 is 1 and 5/9 is zero. Try 9.0/5.0 and 5.0/9.0.
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jlouang jlouang is offline Offline
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Re: temperature help

 
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  #5
May 4th, 2006
thanks I figure out that I was trying to divide a int by a float which wouldn't work of course. changing it to 9.0 and 5.0 works
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