How to write Christmas tree code in C language

Writing: Use three loops to print each line of the Christmas tree. The first loop controls the height of the tree, the second loop prints spaces, and the third loop prints asterisks. In the second loop, n - i is used to control the number of spaces printed in front of each line. As the height increases, the number of spaces will gradually decrease. In the third loop, use 2 * i 1 to control the number of asterisks printed in each line. As the height increases, the number of asterisks will gradually increase. After the second loop, an additional loop is used to print the trunk, making the tree look more complete.

The following is a simple C language Christmas tree code example:

c

#include <stdio.h>  
  
int main() {  
    int i, j, k;  
    int n = 6;  // 树的高度  
  
    for (i = 0; i < n; i++) {  
        for (j = 0; j < n - i; j++) {  
            printf(" ");  
        }  
        for (k = 0; k < 2 * i + 1; k++) {  
            printf("*");  
        }  
        printf("\n");  
    }  
    for (i = 0; i < n - 1; i++) {  
        for (j = 0; j < n - 1 - i; j++) {  
            printf(" ");  
        }  
        for (k = 0; k < n + 1 + i; k++) {  
            printf("*");  
        }  
        printf("\n");  
    }  
    return 0;  
}

In this example, we use three loop to print each row of the Christmas tree. The first loop controls the height of the tree, the second loop prints spaces, and the third loop prints asterisks. In the second loop, we use n - i to control the number of spaces printed in front of each line, since the number of spaces gradually decreases as the height increases. In the third loop, we use 2 * i 1 to control the number of asterisks printed in each line, because as the height increases, the number of asterisks will gradually increase. After the second loop, we also used an additional loop to print the trunk to make the tree look more complete.

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