Write a C program to read in two numbers, x and n, and then compute the sum of this geometric progression: 1+x+x2+x3+????

/*Write a C program to read in two numbers, x and n, and then compute the sum of this geometric progression:
1+x+x2+x3+????.+xn For example: if n is 3 and x is 5, then the program computes 1+5+25+125.
Print x, n, the sum Perform error checking. For example, the formula does not make sense
for negative exponents - if n is less than 0. Have your program print an error message if n<0, 
then go back and read in the next pair of numbers of without computing the sum.
Are any values of x also illegal ? If so, test for them too. */

#include<stdio.h>
#include<conio.h>
#include<math.h>

void main()
{
int s_sum,i,x,n;

clrscr();
printf("Enter the values for x and n:");
scanf("%d %d",&x,&n);
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