This C++ program calculates the sum of geometric progression. The program takes the first term, the common ratio and the number of terms as input. A function is called to calculate the sum of the progression and to print it.

Here is the source code of the C++ program calculates the sum of geometric progression. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

`/*`

`* C++ Program to Calculate Sum of Geometric Progression`

`*/`

`#include <iostream>`

void calSumGP(float a, float r, int n)

`{`

float sum = 0, temp = a;

for (int i = 1; i < n; i++)

`{`

sum = sum + temp;

temp = temp * r;

`}`

std::cout << "Sum of geometric progression : "

<< sum << std::endl;

`}`

int main()

`{`

int n;

float a, r;

std::cout << "Enter the value of a = ";

std::cin >> a;

std::cout << "Enter the value of r = ";

std::cin >> r;

std::cout << "Enter the value of n = ";

std::cin >> n;

calSumGP(a, r, n);

`}`

$ a.out Enter the value of a = 1 Enter the value of r = 2 Enter the value of n = 10 Sum of geometric progression : 511

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