关于X264中的x264_reduce_fraction

#include "stdafx.h"

 

void x264_reduce_fraction( int *n, int *d )
{
    int a = *n;
    int b = *d;
    int c;
    if( !a || !b ) /* 即a和b中，只要有 0 存在 */
        return;
    c = a % b;
    while(c)
    {
 a = b;
 b = c;
 c = a % b;
    }
    *n /= b; /* 把原值改掉了 */
    *d /= b; /* 把原值改掉了 */
}

int main(int argc, char* argv[])
{
 printf("Hello World!\n");
 int a1,b1;
 a1=5;
 b1=25;
 printf("a1=%d\n",a1);
 printf("b1=%d\n",b1);
 printf("**********************************************\n");
 x264_reduce_fraction(&a1,&b1);
 printf("**********************************************\n");
 printf("a1=%d\n",a1);
 printf("b1=%d\n",b1);

 return 0;
}