实验4

#include<stdio.h>
int main(void)
{
    int i,n;
    double x,y;
    double fee(double x);

    printf("Enter n:");
    scanf("%d",&n);

    for(i=1;i<=n;i++)
    {
        printf("Enter x:");
        scanf("%Lf",&x);

        if(x<=0)
            printf("sorry you enter is wrony
");
        else{
            y=fee(x);
        }
        printf("y=%.3f
",y);            
    }
    return 0;
}
double fee(double x)
{
    double y;
        if(x<=50)
        {
            y=0.53*x;
        }
        else
        {
            y=26.5+0.58*(x-50);
        }
    return y;
}

#include<stdio.h>
int main()
{
    int i,n;
    double r,v,h;
    double cylinder(double r,double h);

    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("sorry you enter is wrony!
");
        }
        else{
            v=cylinder(r,h);
            printf("V=%.3f
",v);
        }
    }

    return 0;
}
double cylinder(double r,double h)
{
    double result;
    
    result=3.1415926*r*r*h;
    
    return result;
}

#include<stdio.h>
int main()
{
    int n,i;
    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("sorry you enter is wrony
");
        else if(x<=50){
            y=0.53*x;
         }
         else{
            y=26.5+0.58*(x-50);
         }
         printf("y=%.3f
",y);
    }

    return 0;
}