What is a C programming to calculate the sum of 1-2-3-4-5 and so on using while loop a for loop and a do while loop?

Answer 1

#include

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

int main()
{
int number(1);
cout << endl << "Enter a number to calculate sum of given number of elements: ";
cin >> number;

//using loop for
int sum(0);
for(int i(1); i <= number; i++)
{
sum += i;
}
cout << endl << "Sum of " << number << " loop for gives: " << sum << endl;

//using loop while
sum = 0;
int index(1);
while (index <= number)
{
sum += index;
++index;
}
cout << endl << "Sum of " << number << " loop while gives: " << sum << endl;

//using loop do while
sum = 0;
int index(1);
do
{
sum += index;
++index;
}while (index <= number);
cout << endl << "Sum of " << number << " loop do while gives: " << sum << endl;

system("PAUSE");
return 0;
}