對分式進行約分的算法

歐幾里德算法

/*
歐幾里德算法：輾轉求余
原理： gcd(a,b)=gcd(b,a mod b)
當b為0時，兩數的最大公約數即為a
getchar()會接受前一個scanf的回車符
*/
#include<stdio.h>
unsigned int Gcd(unsigned int M,unsigned int N)
{
    unsigned int Rem;
    while(N > 0)
    {
        Rem = M % N;
        M = N;
        N = Rem;
    }
    return M;
}
int main(void)
{
    int a,b;
    scanf("%d %d",&a,&b);
    printf("the greatest common factor of %d and %d is ",a,b);
    printf("%d\n",Gcd(a,b));
    return 0;
}

來自https://baike.baidu.com/item/%E6%AC%A7%E5%87%A0%E9%87%8C%E5%BE%B7%E7%AE%97%E6%B3%95/9002848?fr=aladdin