实验二 用C语言编写简单程序

#include<stdio.h>
int main(void)
{
    double r,s;
    double cylinder(double r);
    
    printf("Enter r:");
    scanf("%lf",&r);

    if(r<=0){
        printf("输入错误");
    }
    else if(r>0){
        s=3.1415926*r*r;
        printf("s=%.3f
",s);
    }
    return 0;
}

#include<stdio.h>
int main(void)
{
	int i,n;
	double r,h,v;
	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("输入错误,重新输入");
		}
		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(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("输入错误，重新输入");
		}
		else if(x<=50){
			y=0.53*x;
			printf("y=%lf
",y);
		}
		else{
			y=(x-50)*0.58+50*0.53;
			printf("y=%lf
",y);
		}
	}
	return 0;
}

#include<stdio.h>
int main(void)
{
    
    int i,m;
    double x,y;
    double fact(double x);
    double cylinder(double x);

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

    
    for(i=1;i<=m;i++){
        printf("Enter x:");
        scanf("%lf",&x);
        if(x<=0){
        printf("输入错误，重新输入");
        }
        else if(x<=50){
            y=fact(x);
            printf("y=%lf
",y);
        }
        else{
            y=cylinder(x);
            printf("y=%lf
",y);
        }
    }
    return 0;
}
double fact(double x)
{
    double result;
    result=0.53*x;
    return result;
}
double cylinder(double x)
{
    double result;
    result=0.53*50+(x-50)*0.58;
    return result;
}