2/25/15 Homework

main.c

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/types.h>

void forkAndCalculate(int num);

int main(int argc, char **argv){
	if (argc!=2 || argv[1]<0){
		printf("Malformed input!\n");
		return 1;
	}
	int status;
	forkAndCalculate(atoi(argv[1]));
	return 0;
}

void forkAndCalculate(int num){
	int result = fork();
	int status;
	if (result==0){
		printf("%d ",num);
		while (num!=1){
			if (num%2==0){
				num/=2;
			}
			else{
				num*=3;
				num+=1;
			}
			printf("%d ",num);
		} 
		printf("\n");
		exit(0);
	}
	else{
		wait(&status);
		printf("Done!\n");
	}
}