C Program to Find Sum of Geometric Progression Series

In this tutorial, i am going to show you how to find sum of GP series or geometric progression series with the help of formula, for loop and function in c programs.

All C Programs to Find Sum of Geometric Progression Series

  • C Program to Find Sum of Geometric Progression Series using Formula
  • C Program to Find Sum of Geometric Progression Series using For Loop
  • C Program to Find Sum of Geometric Progression Series using Function

C Program to Find Sum of Geometric Progression Series using Formula

/* C Program to find Sum of Geometric Progression Series */
#include <stdio.h>
#include<math.h>
int main() {
    
    int a, n, r;
    float tn, sum = 0;
    
    printf(" Please Enter First Number of an G.P Series:  ");
    scanf("%d", &a);
    printf(" Please Enter the Total Numbers in this G.P Series:  ");
    scanf("%d", &n);
    printf(" Please Enter the Common Ratio:  ");
    scanf("%d", &r);
    
    sum = (a * (1 - pow(r, n ))) / (1- r);
    tn = a * (pow(r, n - 1));
    
    printf("\n The Sum of Geometric Progression Series =  %.2f", sum);
    printf("\n The tn Term of Geometric Progression Series = %.2f \n", tn);
    return 0;
}

The result of the above c program; is as follows:

Please Enter First Number of an G.P Series:  1
Please Enter the Total Numbers in this G.P Series:  5
Please Enter the Common Ratio:  2
The Sum of Geometric Progression Series =  31.00
 The tn Term of Geometric Progression Series = 16.00 

C Program to Find Sum of Geometric Progression Series using For Loop

/* C Program to find Sum of Geometric Progression Series */
#include <stdio.h>
#include<math.h>
int main() {
    
    int a, n, r, value, i;
    float sum = 0;
    
    printf(" Please Enter First Number of an G.P Series:  ");
    scanf("%d", &a);
    printf(" Please Enter the Total Numbers in this G.P Series:  ");
    scanf("%d", &n);
    printf(" Please Enter the Common Ratio:  ");
    scanf("%d", &r);
    
    value = a;
    printf("G.P Series  :  ");
    for(i = 0; i < n; i++)
    {
        printf("%d  ", value);
        sum = sum + value;
        value = value * r;
    }
    printf("\n The Sum of Geometric Progression Series =  %f\n", sum);
    return 0;
}

The result of the above c program; is as follows:

Please Enter First Number of an G.P Series:  2
Please Enter the Total Numbers in this G.P Series:  5
Please Enter the Common Ratio:  2
G.P Series  :  2  4  8  16  32  
 The Sum of Geometric Progression Series =  62.000000

C Program to Find Sum of Geometric Progression Series using Function

/* C Program to find Sum of Geometric Progression Series */
#include <stdio.h>
#include<math.h>
int sumofGP(int a, int n, int r)
{
    int sum = (a * (1 - pow(r, n))) / (1- r);
    return sum;
}
int main() {
    
    int a, n, r;
    float sum = 0;
    
    printf(" Please Enter First Number of an G.P Series:  ");
    scanf("%d", &a);
    printf(" Please Enter the Total Numbers in this G.P Series:  ");
    scanf("%d", &n);
    printf(" Please Enter the Common Ratio:  ");
    scanf("%d", &r);
    
    sum = sumofGP(a, n, r);
    printf("\n The Sum of Geometric Progression Series =  %f\n", sum);
    return 0;
}

The result of the above c program; is as follows:

Please Enter First Number of an G.P Series:  2
Please Enter the Total Numbers in this G.P Series:  5
Please Enter the Common Ratio:  2
The Sum of Geometric Progression Series =  62.000000

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