大家来帮我解决一个c 语言的问题

#define TI 3.14159
main()
{
float r,h,v
printf("Please Input The R :");
scanf("%f",&r);
printf("\nPlease Input The H :");
scanf("%f",&h);
v=TI*r*r*h;
printf("\nThe V is : %f",v);
}

int tiji(int r,int h)
{
int v=0;
v=3.14*r*r*h;
return v;
}
调用时:
void main()
{
int r=10;
int h=5;
int v=tiji(r,h);
}

#include <stdio.h>
float fun(float r,float h)
{ float v;
printf("Please input r,h:");
scanf("%f,%f",&r,&h);
v=3.1415*r*h;
printf("v=%7.2f",v);
}
void main()
{
while(1)
{ float r,h;
printf("Please input r,h:");
scanf("%f,%f",&r,&h);
fun(r,h);
printf("continue?(y/n)");
if(getchar()!='y'&&getchar()!='Y')break;
}
getch