[C language] print pattern summary

Catalog

 

One 、 Print solid graphics

Two 、 Print hollow graphics

3、 ... and 、 Print specific graphics and some typical application problems

Four 、 Some broken thoughts

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Preface ：1. There are many ways of speaking here that may not be so rigorous , Just for the convenience of understanding and memory .

           2. generally speaking , Print graphics , Some require the use of patterns , Some require figures , What is summarized here is with special symbols '*' For example , A summary of common print pattern problems .

One 、 Print solid graphics

【 It is divided into basic non format control and format control （ Need special loop control space ）】

     1. There is little need to control the format

             1. Print rectangle

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

             2. Print right triangle

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

             3. Print inverted triangle

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

 

     2. Circular control format is required

              1. Print backslash

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

              2. Print forward slash

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

              3. Print pyramid （ an isosceles triangle ）

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

              4. Print inverted triangle （ Inverted triangle ）

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

              5. Print diamond

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

Two 、 Print hollow graphics

1. Print a hollow rectangle

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

2. Print hollow triangles

#include <stdio.h>
int main()
{
    int n;
    scanf("%d", &n);
    int i, j;
    for (i = 1;i <= n;i++)
    {
        for (j = 1;j <= i;j++)
        {
            if (i == j || i == 1 || i == n || j == 1)
                printf("* ");
            else
                printf("  ");
        }

        printf("\n");
    }
    return 0;
}

3. Print white diamond

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

4.……

3、 ... and 、 Print specific graphics and some typical application problems

1. Print the Christmas tree

2. Print arrow

3. Print K

4. Print X

5. Yang hui triangle

……

Four 、 Some broken thoughts

The printing pattern is mainly for Cycle to achieve .

① One dimensional graph is generally a for Loop implementation , For example, the printing of line segments .

② Two dimensional graphics are generally for Nested by loops , For example, rectangle , right triangle , The pyramid , The diamond ……

Note here that if the first line of each line 0 The columns have patterns , For example, right triangle （ On the left ）, Just control printing * The distance between , At the same time, the internal circulation condition here is generally for(j=1;j<=i;j++);

If it's like a pyramid , Except for the need to for Loop nesting controls the printing *, Also add an inner loop to specifically control spaces , This condition is generally for(k=1;k<=n-i;k++)

If it's like a diamond , Generally, it needs to print in blocks , It itself can be seen as the combination of two isosceles triangles with a line in the middle . Above is the pyramid , Below is the inverted pyramid （ Refer to the inverted pyramid printing method ）.

③ Specific graphics / The printing of more intuitive graphics is generally a combination of several different types of graphics . So we can package these graphics into functions in the printing process , On this basis, discuss when to print these graphics . One of the most typical is the Christmas tree , It is a combination of several isosceles triangles and rectangles , Concrete realization , Refer to the printing of Christmas tree .

To make a long story short , I demonized it before , It led to cowardice at that time , Now go back to this module , Surprised, surprised , Find out “ It turns out that it's just like this ”~

Learn new knowledge , Through my own thinking 、 Practice and summary it's really fun to understand a kind of topic ~