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Problem with simple c program

This is a discussion on Problem with simple c program within the C Programming forums, part of the General Programming Boards category; My problem is simple the program asks for 2 numbers. Then takes the two numbers Price and Quantity and stores ...

  1. #1
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    Problem with simple c program

    My problem is simple the program asks for 2 numbers. Then takes the two numbers Price and Quantity and stores them in TotalRevenue. The program terminates before it asks for the second number Quantity. It won't let me enter it in. here's the code. There's no errors in the code that's one reason I can't figure it out. If someone has a clue as to what's going on it would be much appreciated. I've been trying to figure this out for two days now.

    Code:
    #include <stdio.h>
    #include <stdlib.h>
    
    int main()
    {
      float Price = 0;
      int Quantity = 0;
      float TotalRevenue; 
      
      printf("\nEnter Price: ");
      scanf("%.2f",&Price);
      printf("\nEnter Quantity: ");
      scanf("%d",&Quantity);
      
      TotalRevenue = Price * Quantity;
      
      printf("\nThe total revenue is: $%.2f\n",TotalRevenue);
      
      system("PAUSE");	
      return 0;
    }

  2. #2
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    If you aren't receiving any compiler warnings, you need to turn up the warning levels.

    Code:
    main.c||In function 'main':|
    main.c|11|warning: unknown conversion type character '.' in format|
    main.c|11|warning: too many arguments for format|
    ||=== Build finished: 0 errors, 2 warnings ===|
    Unlike "printf()", you don't need to use a precision modifier with "scanf()". Try just using "%f".

  3. #3
    Registered User MutantJohn's Avatar
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    Actually, your code works fine for me. I just got rid of the .2 part of your first scanf because when I compiled with it, it didn't like it.

    Here's my output:
    Code:
    
    Enter Price: 123
    
    
    Enter Quantity: 34
    
    
    The total revenue is: $4182.00
    sh: PAUSE: command not found
    I think the PAUSE thing is an OS difference thing but the code finishes.

  4. #4
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    Quote Originally Posted by MutantJohn View Post
    Actually, your code works fine for me. I just got rid of the .2 part of your first scanf because when I compiled with it, it didn't like it.

    Here's my output:
    Code:
    
    Enter Price: 123
    
    
    Enter Quantity: 34
    
    
    The total revenue is: $4182.00
    sh: PAUSE: command not found
    I think the PAUSE thing is an OS difference thing but the code finishes.
    [QUOTE]
    Hey thanks, man you figured that out in one second and I couldn't figure it out for two days dam I feel like a moron!

  5. #5
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    Hey thanks guys I didn't think about scanf it isn't like the printf like you said Wow I wish that would have occured to me

  6. #6
    Registered User MutantJohn's Avatar
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    It's easy to see your logic though. You were trying to only scan in 2 decimal places, weren't you?

    Well, either way, you live and learn and the good news is, now you really know how it works.

    Edit: And to turn up compiler warnings, I think you use something like
    Code:
    gcc -W -Wall -Wextra
    Last edited by MutantJohn; 08-14-2013 at 06:43 PM.

  7. #7
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    Hey thanks, man you figured that out in one second and I couldn't figure it out for two days
    Allow me to repeat myself - maximize your compiler warnings. You could have figured this out yourself in a second had you done so.
    Salem likes this.

  8. #8
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    Quote Originally Posted by Matticus View Post
    Allow me to repeat myself - maximize your compiler warnings. You could have figured this out yourself in a second had you done so.
    i hear this from time to time in this forum. how do you do so? i run both OSx and Linux therefore im just
    Code:
    gcc -o foo foo.c
    what do i need to add to "maximize" my compiler warnings?

  9. #9
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    -Wall (or -Wextra)
    -Werror
    -Wpedantic
    ...etc

    (source)

  10. #10
    CSharpener vart's Avatar
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    To not think about flags every time I compile sample - I created simple Makefile and put all flags I want into it.

    So after changing my c-file contents in the sample directory - I just do make
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

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