What is the output of this program?

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
 
int main()
{
    pid_t child;
    int a, status;
    a = 10;
    child = fork();
    switch(child){
        case -1 :
            perror("fork");
            exit(1);
        case 0 :
            printf("%d\n",a);
            break;
        default :
            wait(&status);
            break;
    }
    return 0;
}