Update

Lab3/Makefile

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+all: ex1.o ex2.o
+	gcc ex1.o -o ex1 -lgmp
+	gcc ex2.o -o ex2
+ex1.o: ex1.c
+	gcc -c ex1.c
+ex2.o: ex2.c
+	gcc -c ex2.c
+clean:
+	rm -f *.o ex1 ex2

Lab3/ex1.c

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+#include <gmp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#define FILE_NAME "numbers.txt"
+#define MAX_SIZE 10
+
+mpz_t array[MAX_SIZE];
+int size = 0;
+
+void readfile() {
+	FILE *file;
+	char str[80];
+	mpz_t temp;
+	mpz_init(temp);
+	file = fopen(FILE_NAME, "r");
+	if (file == NULL) {
+		perror("Can't open file!\n");
+		exit(1);
+	}
+	while (1) {
+		fgets(str, 80, file);
+		if (feof(file)) {
+			break;
+		}
+		if (mpz_set_str(temp, str, 10)) {
+		    perror("Error! Not a number");
+		    exit(1);
+		}
+		mpz_set(array[size++], temp);
+	}
+	mpz_clear(temp);
+	fclose(file);
+}
+
+void count(int n) {
+	int count = 0;
+	mpz_t temp;
+	mpz_init(temp);
+	for (int i = 0; i < size; ++i) {
+	    mpz_mod_ui(temp, array[i], n);
+		if (!mpz_cmp_ui(temp, 0)) {
+			++count;
+		}
+	}
+	printf("Co %d so chia het cho %d.\n", count, n);
+	mpz_clear(temp);
+}
+
+int main() {
+	int child1_pid = 0,
+	    child2_pid = 0,
+	    child3_pid = 0,
+	    parrent_pid = getpid();
+	readfile();
+	child1_pid = fork();
+	if (child1_pid < 0) {
+		perror("Error at 1st pork()!\n");
+		exit(1);
+	} else if (child1_pid == 0) {
+		count(2);
+	}
+	if (parrent_pid == getpid()) {
+		child2_pid = fork();
+		if (child2_pid < 0) {
+			perror("Error at 2nd pork()!\n");
+			exit(1);
+		} else if (child2_pid == 0) {
+			count(3);
+		}
+	}
+	if (parrent_pid == getpid()) {
+		child3_pid = fork();
+		if (child3_pid < 0) {
+			perror("Error at 3rd pork()!\n");
+			exit(1);
+		} else if (child3_pid == 0) {
+			count(5);
+		}
+	}
+	return 0;
+}

Lab3/numbers.txt~

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+12918237493729473291790579217597
+4213412542666666666666665
+321456765
+4432524352352365
+106235754869
+11356243645879870
+345943809680943809584352245
+jweois
+209345790jdsljflks