Printing diamond of beginner C

Use C Language output a diamond diagram , First time study C Language , Record , The code is as follows ：

/*
 ============================================================================
 Name        : Normal1.c
 Author      : zlj
 Version     :
 Copyright   : soft.rz
 Description : Hello World in C, Ansi-style
 ============================================================================
 */

#include <stdio.h>
#include <stdlib.h>

int main(void) {
	/* printf a pict */

	int i,j,k,a,b,c;
	for(a=1; a<=7; a=a+2)
	{
		printf("\t");
		for(b=1; b<=7-a; b=b+2)
		{
			printf(" ");
		}

		for(c=1; c<=a; c++)
		{
			printf("*");
		}
		printf("\n");
	}

	for(i=5; i>=1; i=i-2)
	{
		printf("\t");
		for(j=1; j<=6-i; j=j+2)
		{
			printf(" ");
		}

		for(k=1; k<=i; k++)
		{
			printf("*");
		}
		printf("\n");
	}
	return 0;

}

  Output is as follows ：