格式化输出啊

百度完事！学不会百度的程序员还是别学编程了！

#include <stdio.h>
#include <math.h>

float fun(float x,int m)
{
    int t = pow(10,m+1);//10的m+1次方
    int xt = (int)(x*t);
    int last = xt%10;
    if(last>=5) {
        xt = (xt-last)/10+1;
    } else {
        xt = (xt-last)/10;
    }
    float tmp = xt/(t/10.0);
    printf("tmp=%f\n",tmp);
    return tmp;
}

int main() {
    float x = fun(3.1415926,2);
    float y = fun(3.1415926,4);
    printf("x=%f\n",x);
    printf("y=%f\n",y);

    return 0;
}

写的很乱而且是比较麻烦的做法,但是凑合能用. 多多百度吧