新思维：C语言程序设计

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#include <stdio.h>
int main()
{
    int i, n, product;
    product = 1;
    scanf("%d", &n);
    for (i=2; i<=n; i++)
        product = product * i;
    printf("%d\n", product);
    return 0;
}

#include <stdio.h> int main() { int i, n, product; product = 1; scanf("%d", &n); for (i=2; i<=n; i++) product = product * i; printf("%d\n", product); return 0; }

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#include <stdio.h>
 
#define SIZE 5000
 
int main(int argc, char *argv[])
{
	int i, j, c, n;
	int f[SIZE];
 
	scanf("%d", &n);
 
	for (i=0; i<SIZE; i++) 
		f[i] = 0;
 
	f[0] = 1; /* n=1 */
 
	for(i=2; i<=n; i++) {
		c = 0;
		for (j=0; j<SIZE; j++) {
			c = f[j] * i + c;
			f[j] = c % 10;
			c = c / 10;
		}
	}
 
	/* Print out the result */
	i = SIZE;
	while (f[--i]==0);
	while (i>=0) printf("%d", f[i--]);
 
	return 0;
}

#include <stdio.h> #define SIZE 5000 int main(int argc, char *argv[]) { int i, j, c, n; int f[SIZE]; scanf("%d", &n); for (i=0; i<SIZE; i++) f[i] = 0; f[0] = 1; /* n=1 */ for(i=2; i<=n; i++) { c = 0; for (j=0; j<SIZE; j++) { c = f[j] * i + c; f[j] = c % 10; c = c / 10; } } /* Print out the result */ i = SIZE; while (f[--i]==0); while (i>=0) printf("%d", f[i--]); return 0; }

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import java.math.BigInteger;
import java.util.Scanner;
 
public class P354 {
    public static void main(String[] args) {
        int i, n;
        Scanner cin = new Scanner(System.in);
        n = cin.nextInt();
        BigInteger product = new BigInteger("1");
        for (i = 1; i <= n; i++) 
            product = product.multiply(new BigInteger(String.valueOf(i)));
        System.out.println(product);
    }
}

import java.math.BigInteger; import java.util.Scanner; public class P354 { public static void main(String[] args) { int i, n; Scanner cin = new Scanner(System.in); n = cin.nextInt(); BigInteger product = new BigInteger("1"); for (i = 1; i <= n; i++) product = product.multiply(new BigInteger(String.valueOf(i))); System.out.println(product); } }