2-2 阶梯电价

//阶梯电价 #include<stdio.h>int main(int argc,char const *argv[]){double x,f;printf("请输入月用电量：");scanf("%lf",&x);if(x<=50)f=0.53*x;elsef=0.53*50+0.58*(x-50);printf("电费：%.2f\n",f);return 0;}