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\n",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\n",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\n",y);
}
else{
y=(x-50)*0.58+50*0.53;
printf("y=%lf\n",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\n",y);
}
else{
y=cylinder(x);
printf("y=%lf\n",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;
}