Print diamond pattern

subject ：

Code details ：

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

void fun(int i)
{
	int m, n;
	/**********Program**********/
	for (n = i; abs(n) <= i; n--)// Control by decreasing the number and the absolute value of the number 
	{
		for (m = 0; m <= abs(n); m++)// Number of spaces output 
		{
			printf(" ");
		}
		for (m = 0; m <= (i - abs(n))*2; m++)// Output * Count 
		{
			printf("*");
		}
		printf("\n");
	}
	 /**********  End  **********/
}
int main()
{
	int n;
	scanf("%d", &n);
	fun(n);
}

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