c program to debug

This is a discussion on c program to debug within the C Programming forums, part of the General Programming Boards category; Code: #include<stdio.h> #include<conio.h> #define AM(a,b) ((a+b)/2) #define ABS(d) (d>=0?d:(-d)) #define TOLOWER(ch) (ch=ch+32) #define MAX(a,b) (a>=b?a:b) void main() { int d,abst; ...

  1. #1
    Registered User
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    Mar 2011
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    7

    c program to debug

    Code:
    #include<stdio.h>
    #include<conio.h>
    #define AM(a,b) ((a+b)/2)
    #define ABS(d) (d>=0?d:(-d))
    #define TOLOWER(ch) (ch=ch+32)
    #define MAX(a,b) (a>=b?a:b)
    void main()
    {
     int d,abst;
     float a,b,am,max;
     char ch='A',cl;
     clrscr();
     printf("\nEnter two numbers:");
     scanf("%f%f",&a,&b);
     am=AM(a,b);
     printf("\nThe arithmetic mean of %f and %f is %f",a,b,am);
     printf("\nEnter a number:");
     scanf("%d",&d);
     abst=ABS(d);
     printf("\nThe absolute value of %d is %d",d,abst);
     printf("\nEnter a uppercase character:");
      scanf("%c",&ch);
     cl=TOLOWER(ch);
     printf("c=%c",cl);
     printf("\nEnter two number:");
     scanf("%f%f",&a,&b);
     max=MAX(a,b);
     printf("\nThe bigger of %f and %f is %f",a,b,max);
     getch();
    }
    
    the program is not giving the correct output.
    it automatically take character argument.
    please help me.

  2. #2
    Registered User kryptkat's Avatar
    Join Date
    Dec 2002
    Posts
    638
    Code:
    /* debugchar.c */
    
    #include<stdio.h>
    #include<conio.h>
    #define AM(a,b) ((a+b)/2)
    #define ABS(d) (d>=0?d:(-d))
    #define TOLOWER(ch) (ch=ch+32)
    #define MAX(a,b) (a>=b?a:b)
    int  main()   <== int main see faq  changed from void
    {
     int d,abst;
     float a,b,am,max;
     char ch='A',cl;    <== why do you assign ch = 'A' ? then turn around and scanf ch ?
     clrscr();
     printf("\nEnter two numbers:");  <== two numbers for what ? better description needed.
     scanf("%f%f",&a,&b);
     am=AM(a,b);
     printf("\nThe arithmetic mean of %f and %f is %f",a,b,am);
     printf("\nEnter a number:");
     scanf("%d",&d);
     abst=ABS(d);
     printf("\nThe absolute value of %d is %d",d,abst);
     printf("\nEnter a uppercase character:");
      scanf("%c",&ch);
     cl=TOLOWER(ch);
     printf("c=%c",cl);
     printf("\nEnter two number:");
     scanf("%f%f",&a,&b);
     max=MAX(a,b);
     printf("\nThe bigger of %f and %f is %f",a,b,max);
     getch();
    }
    what is the correct output ? what is the output you were expecting ?

  3. #3
    Registered User
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    Location
    Long Beach, CA
    Posts
    5,513
    Kryptkat already mentioned that you need to use int main. Once you do that, you need to make sure main returns an int at the end, usually 0.

    As for the program automatically "taking character argument", I assume you mean the scanf calls act like you typed in data when you didn't. You actually did type in multiple characters, namely the enter key (a newline character, or '\n' in C). scanf leaves the newline in the input buffer, so next time you ask for data, there's some waiting. Read this FAQ article: Cprogramming.com FAQ > Flush the input buffer.

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