C language basic practice (nine-nine multiplication table) and printing different asterisk patterns

C语言实现九九乘法表的输出

#include<stdio.h>
int main()
{
    
	int i = 0;
	for (i = 1; i <= 9; i++)
	{
    
		int j = 0;
		for (j = 1; j <= i; j++)
		{
    
			printf("%d*%d=%d ", i, j, i * j);
		}
		printf("\n");
	}
	return 0;
}

输出为

1*1=1
2*1=2 2*2=4
3*1=3 3*2=6 3*3=9
4*1=4 4*2=8 4*3=12 4*4=16
5*1=5 5*2=10 5*3=15 5*4=20 5*5=25
6*1=6 6*2=12 6*3=18 6*4=24 6*5=30 6*6=36
7*1=7 7*2=14 7*3=21 7*4=28 7*5=35 7*6=42 7*7=49
8*1=8 8*2=16 8*3=24 8*4=32 8*5=40 8*6=48 8*7=56 8*8=64
9*1=9 9*2=18 9*3=27 9*4=36 9*5=45 9*6=54 9*7=63 9*8=72 9*9=81

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打印平行四边形

#include <stdio.h>
int main()
{
    
	int i, j, n;
	scanf("%d", &n);//The number of lines to print the parallelogram
	for (i = 1; i <= n; i++)
	{
    
		for (j = 1; j <= n - i; j++)
		{
    
			printf(" ");
		}
		for (j = 1; j <= n; j++)
		{
    
			printf("* ");
		}
		printf("\n");
	}
	return 0;
}

打印顶角朝上的等腰三角形

#include <stdio.h>
int main()
{
    
	int i, j, n;
	scanf("%d", &n);//Print the number of rows of an isosceles triangle
	for (i = 1; i <= n; i++)
	{
    
		for (j = 1; j <= n - i; j++)
		{
    
			printf(" ");
		}
		for (j = 1; j <= 2 * i - 1; j++)
		{
    
			printf("*");
		}
		printf("\n");
	}
	return 0;
}

打印top corner down的等腰三角形

#include <stdio.h>
int main ()
{
    
	int i,j,n;
	scanf("%d",&n);
	for(i=1;i<=n;i++)
	{
    
		for(j=1;j<=i-1;j++)
		{
    
			printf(" ");
		}
		for(j=1;j<=2*n-2*i+1;j++)
		{
    
			printf("*");
		}
		printf("\n");
	}
	return 0;
 
}