c语言 8-8

1、

#include <stdio.h>

int gcd(int x, int y)
{
    int max, min, tmp;
    max = x > y ? x : y;
    min = x > y ? y : x;
    
    tmp = x % y;
    if(tmp != 0)
    {
        gcd(min, tmp);    
    }
    else
    {
        return min;
    }
} 

int main(void)
{
    int a, b;
    puts("please input two integers.");
    printf("a = "); scanf("%d", &a);
    printf("b = "); scanf("%d", &b);
    
    printf("result: %d
", gcd(a, b));
    return 0;
}

2、

#include <stdio.h>

int gcd(int x, int y)
{
    int max, min, tmp;
    max = x > y ? x : y;
    min = x > y ? y : x;
    tmp = max - min;
    if(tmp != 0)
        gcd(tmp, min);
    else
        return min;
}

int main(void)
{
    int a, b;
    printf("a = "); scanf("%d", &a);
    printf("b = "); scanf("%d", &b);
    
    printf("result: %d
", gcd(a, b));
    return 0;
}

3、

#include <stdio.h>

int gcd(int x, int y)
{
    int tmp;
    if(x != y)
    {
        if(x > y)
            x -= y;
        else
            y -= x;
        tmp = gcd(x, y);
    }
    else
        tmp = x;
    return tmp;
}

int main(void)
{
    int a, b;
    puts("please input two integers.");
    printf("a = "); scanf("%d", &a);
    printf("b = "); scanf("%d", &b);
    
    printf("result: %d
", gcd(a, b));
    return 0; 
}

4、

#include <stdio.h>

int gcd(int x, int y)
{
    int max, min, tmp;
    max = x > y ? x : y;
    min = x > y ? y : x;
    if(max - min != 0)
    {
        max -= min;
        tmp = gcd(max,min);
    }
    else
        tmp = min;
    return tmp;
}

int main(void)
{
    int a, b;
    puts("please input two integers.");
    printf("a = "); scanf("%d", &a);
    printf("b = "); scanf("%d", &b);
    
    printf("result: %d
", gcd(a, b));
    return 0;
}