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Sum of GP series 𝞢ar^i , i=0,1,2....n

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/* Sum of GP series term by term */
#include<stdio.h>
#include<math.h>
int main()
{
    float a, r, sum=0;
    int n, i;
    printf("Enter the values of a, r, n:\n");
    scanf("%f%f%d", &a, &r, &n);
    for(i=0;i<=n;i++)
    {
        sum=sum+a*pow(r,i);
    }
    printf("Sum of GP series:%f\n", sum);
    return(0);
}
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