C language printing diamond

The goal is ： Print diamond

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analysis ：

It is not difficult to find out the rules by labeling each row and column , Per row per column ’*' No. 1 is empty , It can be judged that 2 Modular calculation . To exclude the upper left and lower right patterns, you need to control the sum of both , Similarly, control the difference between the two to eliminate the other two extra corners .

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Result output ：

#include <stdio.h>
#include <stdlib.h>
int main() {
    
	for (int  j = 1; j < 10; j++)
	{
    
		for (int i = 0; i < 10; i++)
		{
    
			if (i+j>=6 && i+j <=14 && (i+j)%2==0 && i-j<6 && i-j>-6 )
			{
    
				printf("*");
			}
			else
			{
    
				printf(" ");
			}
		}
		printf("\n");

	}
}

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Similarly, analyze the hollow diamond

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



int main() {
    
	for (int j = 1; j < 10; j++)
	{
    
		for (int i = 1; i < 10; i++)
		{
    
			if (i + j == 6 || i + j == 14 || j-i==4 || i-j==4 )
			{
    
				printf("*");
			}
			else
			{
    
				printf(" ");
			}
		}
		printf("\n");

	}
}