题解 | #实现四舍五入#

#include <iostream>
#include<cmath>
using namespace std;

int main() {
    float number;
    cin>>number;
    float c=number;//输入的数字为负数时

    number = fabs(number);
    int a=(int)number;
    float b;
    b = number - (float)a;  //小数部分
    /*正数的四舍五入*/
    if(b>=0.5&&c>=0)  cout<<a+1;
    else if(b<0.5&&c>=0)    cout<<a;
    /*负数的四舍五入*/
    else if(b>=0.5&&c<0)    cout<<(int)c-1;
    else    cout<<(int)c;
}