练习题2016.11.14

1，函数的嵌套，4个整数的最大值

#include <stdio.h>int main(){    int a;    int b;    int c;    int d;    int max;    int max4(int a,int b,int c,int d);    printf("please enter 4 interger number:");    scanf("%d%d%d%d",&a,&b,&c,&d);    max = max4(a,b,c,d);    printf("max=%d\n",max);    return 0;}int max4(int a,int b,int c,int d){    int m;    int max2(int a,int b);    m = max2(a,b);    m = max2(m,c);    m = max2(m,d);    return(m);}int max2(int a,int b){    if(a >= b)    {        return a;    }    else    {        return b;    }}

2,递归求n!

#include <stdio.h>int main(){    int n;    int y;    int fac(int n);    printf("input an integer number:");    scanf("%d",&n);    y = fac(n);    printf("%d != %d\n",n,y);    return 0;}int fac(int n){    int f;    if(n < 0);    {        printf("n < 0,data error!");    }    else    {        f = 1;    }    else    {        f = fac(n - 1) * n;    }    return (f);}