Write program of summation from 1 to 5 using function c plus plus?

Answer 1

There are better ways to do this, but the following example will get the job done all the same.

#include <iostream>

int foo(int & X, int & Y)

{

if( X > Y ) // Ensure X < Y.

{

int T = X; X = Y; Y = T; // Swap.

}

int Total = X;

if( X!=Y) // Skip summation when equal (1 to 1 = 1).

{

int Addend = X; // Begin summation.

while(++Addend <= Y) Total += Addend;

}

return( Total );

}

int main()

{

int X, Y;

std::cout << "Enter start value: ";

std::cin >> X;

std::cout << "Enter end value: ";

std::cin >> Y;

std::cout << std::endl;

std::cout << "The summation of " << X << " to " << Y << " is: " << foo( X,Y);

std::cout << std::endl;

return( 0 );

}