What happens as the SIGINT signal hits the running process of this program?

#include<stdio.h>
#include<signal.h>
#include<stdlib.h>
 
int main()
{
    pid_t child;
    signal(SIGINT,SIG_IGN);
    child=fork();        
    switch(child){
        case -1:             
            perror("fork");
            exit(1);
        case 0:
            while(1){
                printf("Child Process\n");
                sleep(1);
            }
            break;
        default :
            while(1){
                printf("Parent Process\n");
                pause();
            }
            break;
    }
    return 0;
}