#include <iostream>bool foo(double & m){
m = 1.0;
return true;}int main(){
double test = 0.0;
std::cout << "Value of test is : \t" << test << "\tReturn value of function is : "
<< foo(test) << "\tValue of test : " << test << std::endl;
return 0;}Value of test is : 1 Return value of function is : 1 Value of test : 0
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