C Primer Plus Chapter 9 question 10 binary conversion

Write a to_base_n() Accept functions in two 2-10 Parameters in range , Then take the second 1 Hexadecimal print specified in parameter No 2 Number of parameters . for example ,to_base_n(129,8) The result is 201, That is to say 129 The octal number of . Test the function in a complete program .

Here is the code ：

#include <stdio.h>

void to_base_n(int n, int x);
int main(void)
{
	int n, x;
	
	printf("Enter a number and the base for the form of prints.\n");
	printf("Now enter the number in the demical system: ");
	scanf("%d", &x);
	printf("Enter the base of it(2-10): ");
	scanf("%d", &n);
	while(n < 2 && n > 10)
	{
		printf("Enter the base(2-10): ");
		scanf("%d", &n);
	}
	to_base_n(n, x); 
	return 0;
 } 
 
 void to_base_n(int n, int x)
 {
 	if(x < 0)
 	{
 		x *= -1;
 		printf("-");
	 }
 	if(x > 0)
 	{
 		to_base_n(n, x / n);
 		printf("%d", x % n);
	 }
 	return;
 }