Question:Sum of infinite GP series in c programming language 

Answer 
#include<stdio.h>

int main(){

    float a,r;
    float sum=0;

    printf("Enter the first number of the G.P. series: ");
    scanf("%f",&a);

    printf("Enter the common ratio of G.P. series: ");
    scanf("%f",&r);

    if(1 > r)
         sum = a/(1-r);
    else
         sum = a/(r-1);

    printf("\nSum of the infinite G.P. series: %f",sum);

    return 0;
}
Sample output:
Enter the first number of the G.P. series: 1
Enter the common ratio of G.P. series: .5

Sum of the infinite G.P. series: 2.000000

Enter the first number of the G.P. series: 5
Enter the common ratio of G.P. series: 2

Sum of the infinite G.P. series: 5.000000 

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