zhanghr12 @ 2024-01-11 21:11:50

#include<bits/stdc++.h>
using namespace std;
int main()
{
    float x,y;
    cin>>x;
    if(x<=0 && x<5) y=x+2.5;
    if(x<=5 && x<10) y=1.5*(x-3)*(x-3);
    if(x<=10 && x<20) y=x/2-1.5;
    printf("%0.3f", y);
    return 0;
}

by qingchenMC @ 2024-01-11 21:31:08

#include<bits/stdc++.h>

using namespace std;

int main(){
    float x,y=0;
    cin>>x;
    if(x>=0 && x<5)y=-x+2.5;
    else if(x>=5 && x<10)y=2-1.5*(x-3)*(x-3);
    else if(x>=10 && x<20)y=x/2-1.5;
    printf("%0.3f",y);
    return 0;
}

主要是大于等于号写反了，还有式子抄错了一部分，建议养成仔细读题的习惯，把自己的代码和原题仔细对照避免抄错。

by zhanghr12 @ 2024-01-12 22:14:25

感谢dalao调试！！！ O(∩_∩)O

by ZX_XYZ @ 2024-01-20 11:15:25

x=float(input()) if 0<=x<5: y=-x+2.5 if 5<=x<10: y=2-1.5(x-3)(x-3) if 10<=x<20: y=x/2-1.5 print(f"{y:.3f}")