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1.k Shape patterns

describe
KiKi I learned the cycle ,BoBo The teacher gave him a series of printing exercises , The task is to print “*” Composed of K Shape patterns .
Input description ：
Multi group input , An integer （2~20）.

Output description ：
Enter... For each line , For output “” Composed of K shape , Every “” There is a space after .

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

This question Main thought It is divided into n Lower triangle of and n+1 The upper triangle of
Realize The number of characters

2. Arrow pattern

describe
KiKi I learned the cycle ,BoBo The teacher gave him a series of printing exercises , The task is to print “” Arrow shaped pattern composed of .
Input description ：
Multiple groups of input , One integer per row （2~20）.
Output description ：
Enter... For each line , For output “” The shape of an arrow .

#include<stdio.h>
int main()
{
    
    int n=0;
    int i=0;
    int j=0;
    while(scanf("%d",&n)!=EOF)
    {
    
        
    for(i=0;i<n;i++)//g by n The upper triangle of 
    {
    
        for(j=0;j<n-i;j++)// Print space 
        {
    
            printf(" ");
        }
        for(j=0;j<=i;j++)// Number of characters per line 
        {
    
            printf("*");
        }
        printf("\n");
    }
    for(i=0;i<n+1;i++)// by n+1 Lower triangle of 
    {
    
        for(j=0;j<2*i;j++)// Print space 
        {
    
            printf(" ");
        }
        for(j=0;j<n+1-i;j++)// Number of characters per line 
        {
    
            printf("*");
        }
        printf("\n");
    }
    }
    return 0;
}

It is mainly divided into n The upper triangle of and n+1 Lower triangle of
Here we need to pay special attention to the existence of spaces , Every time 2 A space
Both look very outrageous , In fact, they are all formed by the normal upper and lower triangles
The title also requires multiple groups of input If not while Will not pass

3. Backslash pattern

describe
KiKi I learned the cycle ,BoBo The teacher gave him a series of printing exercises , The task is to print “” It's a reverse diagonal pattern .
Input description ：
Multi group input , An integer （2~20）, Represents the number of rows output , It also means to make up the backslash “” The number of .

Output description ：
Enter... For each line , For output “*” The backslash of the composition .

#include<stdio.h>
int main()
{
    
    int i=0;
    int j=0;
    int n=0;
    while(scanf("%d",&n)!=EOF)
    {
    
        for(i=0;i<n;i++)//  Behavior n  As a n  The square of 
        {
    
            for(j=0;j<n;j++)
            {
    
                if(i==j)
                {
    
                    printf("* ");
                }
                else
                printf(" ");
            }
            printf("\n");
        }
       
    }
    return 0;
}

We just need to think of this as a square Each is marked with a subscript If i The coordinates and j The coordinates of are equal Is the pattern in the figure
Here's the thing to notice ; Be sure to add the return that cannot meet the condition Space , Otherwise it won't pass

4. Slash pattern

describe
KiKi I learned the cycle ,BoBo The teacher gave him a series of printing exercises , The task is to print “” It's a straight diagonal pattern .
Input description ：
Multi group input , An integer （2~20）, Represents the number of rows output , It also means that it is composed of “” The number of .
Output description ：
Enter... For each line , For output “*” The forward and diagonal lines formed .

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

``

We just need to think of this as a square Each is marked with a subscript If i Coordinates of plus j The coordinates of are row or column +1
Is the pattern in the figure
Here's the thing to notice ; Be sure to add the return that cannot meet the condition Space , Otherwise it won't pass

5. Hollow square pattern

describe
KiKi I learned the cycle ,BoBo The teacher gave him a series of printing exercises , The task is to print “” Composed of “ Hollow ” Square pattern .
Input description ：
Multi group input , An integer （3~20）, Represents the number of rows output , It also means that the sides of a square are made up of “” The number of .
Output description ：
Enter... For each line , For output “” Composed of “ Hollow ” Square , Every “” There is a space after .

#include <stdio.h>
int main()
{
    
  int n = 0;
  while(scanf("%d", &n) != EOF)
  {
    
      for(int i=0; i<n; i++)  // The outer loop is a line 
      {
    
         for(int j=0; j<n; j++) // The inner loop is listed as 
         {
    
            if(i==0||i==n-1||j==0||j==n-1)// Looking for a regular 
                 printf("* ");
             else
                 printf(" ");
         }
         printf("\n"); 
      }
  }
}

We just need to think of this as a square Each is marked with a subscript
When the first line , Enter characters on the last line
When it is the first column , Enter characters in the last column
The most important thing to pay attention to here is ： The space is two spaces Don't ask me. How do you know
Almost spit blood

summary

From Cattle from The exercises of
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