20131014课堂实验3

#include<stdio.h>
#include<math.h>
int main(void)
{
    double S,R,i;
    
    printf("Enter R:");
    scanf("%Lf",&R);
    i=pow(R,2);

    if(R<=0){
        printf("Erro!");
    }
    else{
        S=3.1415926*i;
        printf("S=%.2f
",S);
    }

        return 0;
}

#include<stdio.h>
int main(void)
{
    int H,n,i;
    double R,V;
    printf("Enter n:");
    scanf("%d",&n);
    printf("Enter R:");
    scanf("%Lf",&R);
    printf("Enter H:");
    scanf("%d",&H);
    V=3.1415926*R*R*H;
    
    
    if(R<=0||H<=0){
        printf("Erro!");
    }
    else
        for(i=1;i<=n;i++)    

            V=V*i;
        printf("V=%.2f",V);
        return 0;
}