#include  #include  #include  #define MAX_COUNT 200 #define BUF_SIZE 100 void ChildProcess(char [], char []); /* child process prototype */ void ParentProcess(void); /* parent process prototype */ void main(void) { pid_t pid1, pid2, pid; int status; int i; char buf[BUF_SIZE]; printf("*** Parent is about to fork process 1 *** "); if ((pid1 = fork()) < 0) { printf("Failed to fork process 1 "); exit(1); } else if (pid1 == 0) ChildProcess("First", " "); printf("*** Parent is about to fork process 2 *** "); if ((pid2 = fork()) < 0) { printf("Failed to fork process 2 "); exit(1); } else if (pid2 == 0) ChildProcess("Second", " "); ParentProcess(); sprintf(buf, "*** Parent enters waiting status ..... "); write(1, buf, strlen(buf)); pid = wait(&status); sprintf(buf, "*** Parent detects process %d was done *** ", pid); write(1, buf, strlen(buf)); pid = wait(&status); printf("*** Parent detects process %d is done *** ", pid); printf("*** Parent exits *** "); exit(0); } #define QUAD(x) (x*x*x*x) void ParentProcess(void) { int a, b, c, d; int abcd, a4b4c4d4; int count = 0; char buf[BUF_SIZE]; sprintf(buf, "Parent is about to compute the Armstrong numbers "); write(1, buf, strlen(buf)); for (a = 0; a <= 9; a++) for (b = 0; b <= 9; b++) for (c = 0; c <= 9; c++) for (d = 0; d <= 9; d++) { abcd = a*1000 + b*100 + c*10 + d; a4b4c4d4 = QUAD(a) + QUAD(b) + QUAD(c) + QUAD(d); if (abcd == a4b4c4d4) { sprintf(buf, "From parent: " "the %d Armstrong number is %d ", ++count, abcd); write(1, buf, strlen(buf)); } } sprintf(buf, "From parent: there are %d Armstrong numbers ", count); write(1, buf, strlen(buf)); } void ChildProcess(char *number, char *space) { pid_t pid; int i; char buf[BUF_SIZE]; pid = getpid(); sprintf(buf, "%s%s child process starts (pid = %d) ", space, number, pid); write(1, buf, strlen(buf)); for (i = 1; i <= MAX_COUNT; i++) { sprintf(buf, "%s%s child's output, value = %d ", space, number, i); write(1, buf, strlen(buf)); } sprintf(buf, "%s%s child (pid = %d) is about to exit ", space, number, pid); write(1, buf, strlen(buf)); exit(0); } 

I need the output of the program. PLZ explain the output/resul by using graph and table.