Java Program to Print Envelope Star Pattern

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Program to Print Envelope Star Pattern

In this article we are going to see how to print the envelope star pattern

Example

       *
     * * *
   * * * * *
* * * * * * *
*              *
* *         * *
* * *    * * *
* * * * * * *
* * *    * * *
* *         * *
*              *
* * * * * * *
  * * * * *
     * * *
       *

Now, let’s see the actual program to print it.

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Approach:

  • Create a function printTriangle to print a triangle.
  • Call the function 4 times to print multiple triangles with star pattern.
  • Print a newline after each iteration.

C Code:

#include <stdio.h>
int printTriangle(int no_triangles, int i, int space)
{ //Function to print triangles
    char star_char = '*';
    int r, c;
    for (r = no_triangles; r >= 1; r--)
    {
        printf("  ");
    }
    for (c = 1; c <= i; c++)
    {
        if (space != 0)
        {
            if (i == 4 && c == 1)
            {
                continue;
            }
        }
        printf("%2c", star_char);
    }
    return 0;
}
int main()
{
    int iter, no_triangles = 4;
    for (iter = 1; iter <= 7; (iter = iter + 2))
    { //Prints the first triangle
        printTriangle(no_triangles, iter, 0);
        no_triangles--;
        printf("\n");
    }
    no_triangles = 5;
    for (iter = 1; iter <= 4; iter++)
    { //Prints the second triangle
        printTriangle(1, iter, 0);
        printTriangle(no_triangles, iter, 1);
        no_triangles = no_triangles - 2;
        printf("\n");
    }
    no_triangles = 1;
    for (iter = 3; iter >= 1; iter--)
    { //Prints the third triangle
        printTriangle(1, iter, 0);
        printTriangle(no_triangles, iter, 0);
        no_triangles = no_triangles + 2;
        printf("\n");
    }
    no_triangles = 1;
    for (iter = 7; iter >= 1; (iter = iter - 2))
    { //Prints the last triangle
        printTriangle(no_triangles, iter, 0);
        no_triangles++;
        printf("\n");
    }
    return 0;
}

Output

      *
    * * *
  * * * * *
* * * * * * *
*              *
* *         * *
* * *    * * *
* * * * * * *
* * *    * * *
* *         * *
*              *
* * * * * * *
  * * * * *
    * * *
      *

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