syntax error

Question

how to solve syntax error code below
#include<stdio.h>
#include<conio.h>
float area(float);
float perimeter(float);
#define p 3.14
int main()
{
float r;
scanf("%f",&r);
printf("s= %f\np= %f",area(),perimeter());
}
float area(float s)
{
float s;
s=p*r*r;
return s;
}
float perimeter(float p)
{
float p;
p=2*p*r;
return p;
}

Answer 1

float r;
This definition must be outside of main, or r must be a parameter of perimeter and area.
In addition, area and perimeter are defined as functions with parameter, but called without parameter.

Answer 2

thanks for help