P39-习题2-2-单户电费

#include<stdio.h>
int main(void)
{
    double x,y;
/*定义y为电费，x为用电量*/

    printf("Enter x(x>=0):
");
    scanf("%lf",&x);
/*if语句进行分段计算*/
    if(x<=50){
        y=0.53*x/3;
    }
    else{
        y=0.58*x-2.5;
    }
    printf("y=f(%f)=%.2f
",x,y);


    return 0;
}