C program for calculating Geometric Progression (GP)

In mathematics, a geometric progression, also known as a geometric sequence, is a sequence of numbers where each term after the first is found by multiplying the previous one by a fixed, non-zero number called the common ratio. For example, the sequence 2, 6, 18, 54, ... is a geometric progression with common ratio 3. Similarly 10, 5, 2.5, 1.25, ... is a geometric sequence with common ratio 1/2.

Examples of a geometric sequence are powers r^k of a fixed number r, such as 2^k and 3^k. The general form of a geometric sequence is

a,\ ar,\ ar^2,\ ar^3,\ ar^4,\ \ldots

where r ≠ 0 is the common ratio and a is a scale factor, equal to the sequence's start value.

************************************************************Program***********************************************************

#include<stdio.h>
#include<conio.h>
main()
{
    int a,n,r,t;
    printf("Enter the first term of your GP : ");
    scanf("%d",&a);
    printf("Enter the ratio(r) : ");
    scanf("%d",&r);
    printf("Enter the number of terms you want to get in your GP : ");
    scanf("%d",&n);
    printf("GP of your given data is :\n%d ",a);
    while(n>=0)
    {
        t=a*r;
        printf("%d ",t);
        a=t;
        n--;
    }
    getch();
}