题解 | #实现四舍五入#

#include <iostream>
using namespace std;

int main() {
    double dNum;
    cin >> dNum;
    if (dNum > 0) {
        if ( (bool)(dNum - (int)dNum >= 0.5) ) {
            cout << (int)dNum + 1 << endl;
        } else {
            cout << (int)dNum << endl;
        }
    } else if (dNum < 0) {
        if ( (bool)(dNum - (int)dNum <= -0.5) ) {
            cout << (int)dNum - 1 << endl;
        } else {
            cout << (int)dNum << endl;
        }
    } else {
        cout << dNum;
    }

}
// 64 位输出请用 printf("%lld")