when would waitpid() be useful code example

Example: example code of waitpid

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/wait.h>
#include <string.h>

int main(){
	int pid;
    int status;
    pid =fork();
    if(pid<0){
        printf("Error");
    }
    else if(pid==0){
         // Child Process
         for(int i=0;i<100;i++){
            value-=1;
            printf("%d \n",value);
         }
        exit(EXIT_SUCCESS);
    }
	
   waitpid(pid,&status,0); // WAIT till child gets over
	// Parent process
   for(int i=0;i<100;i++){
            value-=1;
            printf("%d \n",value);
         }
   printingFunction();
    if (WIFSIGNALED(status)){
        printf("Error\n");
    }
    else if (WEXITSTATUS(status)){
        printf("Exited Normally\n");
    }
    return 0;
    
	}
}