Not getting a value returned

[ftothemizzo]

I need this program to output the value of the bmr function. once i input height wieght and age nothing is happening. thanks in advance!

 #include <iostream> 
#include <cmath> 
#include <cstdlib>

using std::cin; using std::cout; using std::endl;

double bmrmen(double h, double w, double a);
double bmrwomen(double h, double w, double a);
const int cpg = 354;

int main(){

	cout << "Enter gender [m/f]: ";
	char gen;
	cin >> gen;

	if (gen = 'm'){
		cout << "Input height, weight, and age: \n";
		double h, w, a;
		cin >> h >> w >> a;
		bmrmen(h, w, a);
	
	} else if (gen = 'f'){
		cout << "Input height, weight, and age: \n";
		double h, w, a;
		cin >> h >> w >> a;
		bmrwomen(h, w, a);
	}
}
	double bmrmen(double h, double w, double a){
		cin >> h >> w >> a;
		double bmr = 66 + (6.3 * w) + (12.9 * h) - (6.8 * a);
		return bmr;
	}

	double bmrwomen(double h, double w, double a){
		cin >> h >> w >> a;
		double bmr = 655 + (4.3 * w) + (4.7 * h) - (4.7 * a);
		return bmr;
	}

[admkrk]

You need to tell the program to output the value. One way would be like this:
cout << bmrmen(h, w, a);

Also get rid on this in your functions:
cin >> h >> w >> a;