7-20 print 99 formula table (format output)

Here's a complete list of the bottom triangle and nine nines ：

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

This question requires any given positive integer N, Output from 1*1 To N*N Part of the formula table .

Input format ：
Input gives a positive integer on a line N（1≤N≤9）.

Output format ：
Output the lower triangle N*N Part of the formula table , The number to the right of the equal sign is 4 position 、 Align left .

sample input ：
4
sample output ：
1*1=1   
1*2=2   2*2=4   
1*3=3   2*3=6   3*3=9   
1*4=4   2*4=8   3*4=12  4*4=16  

analysis ： The subject is very simple , Only loop nesting is needed to complete , There is a knowledge point here, which is to occupy four places , How to occupy the fourth place ,-4d Four digits after the number ,4d It's four digits in front of the number .

Code implementation ：

#include<stdio.h>
int main()
{
    int n=0;
    scanf("%d",&n);
    int i=0,j=0;
    for(i=1;i<=n;i++){// Outer loop control line  
        for(j=1;j<=i;j++){// Inner loop control column  
            printf("%d*%d=%-4d",j,i,i*j);
        }
        printf("\n");
    }
    return 0;
}

Link to the original text ：https://blog.csdn.net/zoroly/article/details/119768226