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Playing with inputs

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Join Date: Apr 2004

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Asif_NSU

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Playing with inputs

Aug 30th, 2004

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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Join Date: Apr 2004

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Dave Sinkula Dave Sinkula is offline

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long time no c

Re: Playing with inputs

Aug 30th, 2004

One way:

 Help with Code Tags 
 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
 */

"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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Join Date: Apr 2004

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Asif_NSU

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Re: Playing with inputs

Aug 30th, 2004

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.

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Join Date: Sep 2004

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GDFans

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Re: Playing with inputs

Sep 4th, 2004

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

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Join Date: Apr 2004

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Asif_NSU

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Posting Whiz

Re: Playing with inputs

Sep 4th, 2004

•

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.

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Join Date: Apr 2004

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Dave Sinkula Dave Sinkula is offline

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long time no c

Re: Playing with inputs

Sep 4th, 2004

•

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...

 Help with Code Tags 
 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
 */