Update

Lab2/Makefile

@@ -0,0 +1,10 @@
+all: main.o factorial.o readline.o
+	gcc main.o factorial.o readline.o -o myfactorial -lgmp
+main.o: main.c factorial.h readline.h
+	gcc -c main.c
+factorial.o: factorial.c factorial.h
+	gcc -c factorial.c
+readline.o: readline.c readline.h
+	gcc -c readline.c
+clean:
+	rm -f *.o myfactorial

Lab2/factorial.c

@@ -0,0 +1,16 @@
+#include "gmp.h"
+#include "factorial.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+char *factorial(const int aNumber) {
+	int i;
+	mpz_t p;
+	mpz_init_set_ui(p, 1);
+	for (int i = 1; i <= aNumber; ++i) {
+	    mpz_mul_ui(p, p, i);
+	}
+	char * ret = mpz_get_str(NULL, 10, p);
+	mpz_clear(p);
+	return ret;
+}

Lab2/factorial.c~

@@ -0,0 +1,16 @@
+#include "gmp.h"
+#include "factorial.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+char *factorial(const int aNumber) {
+	int i;
+	mpz_t p;
+	mpz_init_set_ui(p, 1);
+	for (int i = 1; i <= aNumber; ++i) {
+	    mpz_mul_ui(p, p, i);
+	}
+	char * ret = mpz_get_str(NULL, 10, p);
+	mpz_clear(p);
+	return ret;
+}

Lab2/factorial.h

@@ -0,0 +1,6 @@
+#ifndef FACTORIAL_H
+#define FACTORIAL_H
+
+char *factorial(const int aNumber);
+
+#endif

Lab2/main.c~

@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "readline.h"
+#include "factorial.h"
+
+int main(int argc, char *argv[]) {
+	char *str = (char *) malloc(51);
+	int t = 0,
+	    i = 0;
+	scanf("%d\n", &t);
+	while (i < t) {
+		if (read_line(str)) {
+			int a = atoi(str);
+			char *str = factorial(a);
+			if (t != NULL) {
+			    puts(t);
+			    free(t);
+			} else {
+			    printf("Overflow!\n");
+			}
+		} else {
+			printf("%d\n", -1);
+		}
+		++i;
+	}
+	free(str);
+	return 0;
+}

Lab2/readline.c

@@ -0,0 +1,17 @@
+#include "readline.h"
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int read_line(char *str) {
+	fgets(str, 51, stdin);
+	fputs(str, stdout);
+	int i = 0;
+	while (str[i] != '\n') {
+		if (!isdigit(str[i])) {
+			return 0;
+		}
+		++i;
+	}
+	return 1;
+}

Lab2/readline.h

@@ -0,0 +1,6 @@
+#ifndef READ_LINE_H
+#define READ_LINE_H
+
+int read_line(char *str);
+
+#endif