7-2 ch3实验 分段函数计算

Question

Answer 1

#include<stdio.h>
int main() 
{
   int x,y;
   scanf("%d",&x);
   if(x<0){
       y=0;
   }else if(x>=0 && x<5){
       y=x;
   }else if(x>=5 && x<10){
       y=3*x-5;
   }else if(x>=10 && x<20){
       y=0.5*x-2;
   }else if(x>=20){
       y=0;
   }
   printf("%d",y);
    return 0;
}