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cloopscharscanf

how to use scanf with integers or a char in c

Basically I have a simple loop that has a scanf

int main(void){
 int num, i;
  
 for(i=0; i<100; i++){
 printf("enter a number or Q to quit");
 scanf("%d",&num);
 }
}

How can I use scanf with integers to keep the loop going and for the Chars 'Q' and 'q' to stop the loop by setting i to 100.

Solution

  • Can't claim that this will work in all cases, but it seems to work for me.

    int main() {
    int num, i;
    char q;

    for( i = 0; i < 100; i++ ) {
        printf("enter a number or Q to quit: ");
        if( scanf("%d",&num) != 1 ) {
            scanf( " %c", &q );
            printf( "picked up %c\n", q );
        }
        printf("number %d\n", num );

    }
    return 0;
}

    enter a number or Q to quit: 42
number 42
enter a number or Q to quit: 27
number 27
enter a number or Q to quit: q
picked up q
number 27

    It's not very good code... You really should use fgets() and interpret whatever buffer load you get from the user.