实验 4 在分支循环结构中调用自定义函数

#include<stdio.h>
int main(void)
{
    int i,n;
    double x,y;
    printf("enter n:");
    scanf("%d",&n);

    for(i=1;i<=n;i++){
    
    printf("Enter x:
");
    scanf("%lf",&x);
    if (x<=0){
        printf("wrong
");
    }
    else if(x<=50){
        y=x*0.53;
    }
    else{
        y=x*0.53+(x-50)*0.58;
    }
    printf("f%.0f=%.0f
",x,y);
    }
      
         return 0;
    }

/计算圆柱体积/
#include<stdio.h>
int main()
{
    int i,n;
    double r,v,h;
    double cylinder(double r,double h);          /函数声明/ 
     
    printf("enter n:");
    scanf("%d",&n);

    for(i=1;i<=n;i++){
        printf("Enter r and h:
");

        scanf("%lf%lf",&r,&h);

        if((r<=0)||(h<=0))
        {
            printf("输入错误，重新输入");
        }
        else{
            v=cylinder(r,h);            /调用函数，返回值赋给volume/
            printf("V=%.3f
",v);
        }
    }

    return 0;
}
double cylinder(double r,double h)
{
    double result;
    
    result=3.1415926*r*r*h;           /计算圆柱体积/
    
    return result;     /返回结果/

}

/计算电价/
#include<stdio.h>
int main(void)
{
    int i;
    double y;
    printf("enter i(i>0):");
    scanf("%d",&i);        
    if(i<50){
        y=0.53*i;
    }
    else if(i>50){
        y=0.53*i+(i-50)*0.58;
    }
    printf("y=%.2f
",y);
    return 0;
}