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Aug 30th, 2004

Playing with inputs

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In my program i will be taking two inputs, lets say two integers. If the number of input is more than two the program will exit. If it is two then the loop will be executed and after that it will again ask for two new inputs-- and will continue this way. How do I accomplish this in PURE C(no C++)? I know this is not necessary to do in any sort of program, but asking just out of curiosity.

Another ques: also how do I clear the input stream in C(not clrscr())?

Last edited by Asif_NSU; Aug 30th, 2004 at 5:17 pm. Reason: none

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Asif_NSU

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Posting Whiz

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Aug 30th, 2004

Re: Playing with inputs

One way:

C++ Syntax (Toggle Plain Text)
#include <stdio.h>
 
 int main(void)
 {
    int a,b;
    char line [ BUFSIZ ];
    for ( ;; )
    {
 	  fputs("Enter two integer: ", stdout);
 	  fflush(stdout);
 	  if ( fgets(line, sizeof line, stdin) )
 	  {
 		 if ( sscanf(line, "%d%d", &a, &b) != 2 )
 		 {
 			return 0;
 		 }
 		 printf("a = %d, b = %d\n", a, b);
 	  }
    }
    return 0;
 }
 
 /* my output
 Enter two integer: 12 45
 a = 12, b = 45
 Enter two integer: 11
 */
#include <stdio.h>
 
 int main(void)
 {
    int a,b;
    char line [ BUFSIZ ];
    for ( ;; )
    {
 	  fputs("Enter two integer: ", stdout);
 	  fflush(stdout);
 	  if ( fgets(line, sizeof line, stdin) )
 	  {
 		 if ( sscanf(line, "%d%d", &a, &b) != 2 )
 		 {
 			return 0;
 		 }
 		 printf("a = %d, b = %d\n", a, b);
 	  }
    }
    return 0;
 }
 
 /* my output
 Enter two integer: 12 45
 a = 12, b = 45
 Enter two integer: 11
 */

Dave Sinkula

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long time no c

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Aug 30th, 2004

Re: Playing with inputs

thanx man! But the program should also quit if there are more than two inputs. I can see the program discards additional inputs but i want it to exit for more than two inputs.

Asif_NSU

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Posting Whiz

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Sep 4th, 2004

Re: Playing with inputs

easy.
You can use 'exit(0)' instead of 'return 0'

GDFans

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Sep 4th, 2004

Re: Playing with inputs

Quote ...

easy.
You can use 'exit(0)' instead of 'return 0'

What are u talking about? I dont see how replacing 'return 0' with exit(0) in the program provided by dave makes any difference.

Asif_NSU

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Posting Whiz

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Sep 4th, 2004

Re: Playing with inputs

Quote originally posted by Asif_NSU ...

thanx man! But the program should also quit if there are more than two inputs. I can see the program discards additional inputs but i want it to exit for more than two inputs.

There are several ways. I would prefer to respond to one that says, "I've tried this <insert code>, but it doesn't do what I expect." But...

C++ Syntax (Toggle Plain Text)
#include <stdio.h>
 
 int main(void)
 {
    int a,b,n;
    char line [ BUFSIZ ];
    for ( ;; )
    {
 	  fputs("Enter two integers: ", stdout);
 	  fflush(stdout);
 	  if ( fgets(line, sizeof line, stdin) )
 	  {
 		 if ( sscanf(line, "%d%d%n", &a, &b, &n) == 2 && line [ n ] == '\n')
 		 {
 			break;
 		 }
 	  }
 	  puts("try again");
    }
    printf("a = %d, b = %d\n", a, b);
    return 0;
 }
 
 /* my output
 Enter two integers: 1
 try again
 Enter two integers: 1 2 3
 try again
 Enter two integers: a b
 try again
 Enter two integers: 1 2a
 try again
 Enter two integers: 1 2
 a = 1, b = 2
 */
#include <stdio.h>
 
 int main(void)
 {
    int a,b,n;
    char line [ BUFSIZ ];
    for ( ;; )
    {
 	  fputs("Enter two integers: ", stdout);
 	  fflush(stdout);
 	  if ( fgets(line, sizeof line, stdin) )
 	  {
 		 if ( sscanf(line, "%d%d%n", &a, &b, &n) == 2 && line [ n ] == '\n')
 		 {
 			break;
 		 }
 	  }
 	  puts("try again");
    }
    printf("a = %d, b = %d\n", a, b);
    return 0;
 }
 
 /* my output
 Enter two integers: 1
 try again
 Enter two integers: 1 2 3
 try again
 Enter two integers: a b
 try again
 Enter two integers: 1 2a
 try again
 Enter two integers: 1 2
 a = 1, b = 2
 */

Dave Sinkula

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long time no c

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since Apr 2004

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