C++ warning: control reaches end of nonvoid funtion
I keep getting a C++ warning: control reaches end of nonvoid function on the last two }. Someone please help me.
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#include <iostream>
#include <iomanip>
#include <cmath>
#include <math.h>
using namespace std;
char s = '\0';
const char SENTINEL = 's';
float radius, answer;
void get_radius (float&);
float surface_area (float);
float volume (float);
float cross_section (float);
const float PI = 3.14;
int main()
{
cout << "This program will let you input the radius of a sphere to find its volume or surface area." << endl << endl;
cout << "Enter 'v' for volume or 'a' for surface area of a sphere" << endl;
cout << "'s' to stop" << endl;
cin >> s;
while (s != SENTINEL)
{
get_radius (radius);
if(s == 'V')
{
volume (radius);
}
else if(s == 'A')
{
surface_area (radius);
}
cout << "Enter 'v' for volume or 'a' for surface area of a sphere" << endl;
cout << "'s' to stop" << endl;
cin >> s;
}
system("PAUSE");
return 0;
}
void get_radius (float& radius)
{
cout << "Please enter the radius of the sphere: " << endl;
cin >> radius;
}
float volume (float radius){
float answer;
answer = 4.0/3.0 * PI * pow (radius, 3);
cout << "The volume is: " << answer << endl;
}
float surface_area (float radius){
float answer;
answer = 4.0 * PI * pow(radius, 2);
cout << "The surface area is: " << answer << endl;
}
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