例1:求1到100的和.

#include <stdio.h>

int sum(int n){

    if (n == 1)return 1;

    return sum(n-1) + n;

}

int main(int argc, const char * argv[]) {

    printf("sum(100) = %d",sum(100));

    return 0;

}

例2:求阶乘(n!)

#include <stdio.h>

int sum(int n){

    if (n == 1)return 1;

    return sum(n-1)*n;

}

int main(int argc, const char * argv[]) {

    printf("sum = %d",sum(4));

    return 0;

}

哎呦，不错哦，顶一下、、