C++ Program to Calculate Sum of Geometric Progression

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.

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

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 */
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#include <iostream>
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void calSumGP(float a, float r, int n)
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{
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    float sum = 0, temp = a;
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    for (int i = 1; i < n; i++)
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    {
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        sum = sum + temp;
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        temp = temp * r;
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    }
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    std::cout << "Sum of geometric progression : "

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              << sum << std::endl;
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}
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int main()
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{
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    int n;
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    float a, r;
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    std::cout << "Enter the value of a = ";

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

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

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    std::cin  >> n;
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    calSumGP(a, r, n);
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}
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$ 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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