[algogeeks] Explain the output

[Jitendra Kushwaha]

#include<stdio.h>
int main() {
        int id,i;

        if((id=vfork())==0) {           //child
                printf("in child\n");
                sleep(3);
                printf("%d\n",i);
        }
        else {                          //parent
                printf("in parent\n");
                scanf("%d",&i);
                sleep(1);
                printf("%d\n",i);
        }
        return 0;
}

can anybody answer why output of this program going in a loop.
(tested on  gcc 4.4 compiler)

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