CODEWITHSUNDEEP
cloops
Maddy
Maddy

Reputation: 17

Infinite loop till key pressed

#include <stdio.h>
void main()
{
    int a=1;
    char c;
    x:for(a=1;a!=0;a++)
    {
        printf("Hello\n");
        c=getch();
        if(c=='n')
            exit(0);
        else
            goto x;
    }
}

//please assist me with this program by using primary operators only

Upvotes: 0

Views: 2314

Answers (3)

Simp Slayer
Simp Slayer

Reputation: 112

Try this.

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
int main(void) {
    char c='y';
    while(c!='n') {
        while(!kbhit()) {
            printf("Hello\n");
        }
        c=getch();
    }
}

Please note that I have not compiled this as conio.h is not available to me right now.

Upvotes: 0

user3629249
user3629249

Reputation: 16540

the posted code does not compile!

The following code will do the job.

Notice that the goto is eliminated

Notice that the unneeded variables are eliminated

Notice that the appropriate header files are included

Notice the signature for the main() function is corrected

#include <stdio.h> // printf()
#include <conio.h> // getch() kbhit() <-- use correct header file

int main( void )          // <-- use valid signature
{
                          // <-- eliminate unneeded variables
    while(1)              // <-- non-confusing (and simple) loop statement
    {
        printf("Hello\n");

        if( kbhit() )
        { // then some key has been pressed
            if( 'n' == getch() )
            { // then 'n' key has been pressed
                break;        // <-- exit the loop
            }
        }
    }
} // end function: main

Upvotes: 1

Weather Vane
Weather Vane

Reputation: 34585

This is a little different, to show you a simple solution. But if you are not allowed to use kbhit you are stuck.

#include <stdio.h>
#include <conio.h>              // include the library header

int main(void)                  // correct signature for main
{
    int c = 0;                  // note getch() returns `int` type
    while(c != 'n')             // until correct key is pressed
    {
        do {                    // forever
            printf("Hello\n");
        } while(!kbhit());      // until a key press detected
        c = getch();            // fetch that key press
    }
    return 0;
}

Remember, it only tests for lower-case n.

Upvotes: 1

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