C Language Tasks for Beginners

 Code :

#include <stdio.h>
int main()
{
    int i, j, k;
    for (i = 1; i <= 4; i++)
    {
        for (j = 5; j >= i; j--)
        {
            printf(" ");
        }
        for (k = 1; k <= (i*2)-1; k++)
        {
            if (k==1 || k==(i*2)-1)
            {
                printf("*");
            }
            else{
                printf(" ");
            }
        }
        printf("\n");
    }

    for (i = 5; i >= 1; i--)
    {
        for (j = 5; j >= i; j--)
        {
            printf(" ");
        }
        for (k = 1; k <= (i*2)-1; k++)
        {
            if (k==1 || k==(i*2)-1)
            {
                printf("*");
            }
            else{
                printf(" ");
            }
        }
        printf("\n");
    }
    return 0;
}

• Header File: #include <stdio.h> is needed to use printf() for printing output.
• Main Function: The program starts from int main(). It returns 0 to indicate successful completion.
• First Outer Loop (Top Section): The first outer for loop (i = 1 to i <= 4) controls the rows of the top section, with spaces decreasing and stars being printed at the borders of each row, creating a hollow triangle shape.
• Inner Loop 1 (Spaces for Top Section): The first inner for loop (j = 5 to j >= i) prints spaces, decreasing the number of spaces as the row number increases.
• Inner Loop 2 (Hollow Stars for Top Section): The second inner for loop (k = 1 to k <= (i * 2) - 1) prints stars (*) only at the first and last positions, leaving spaces in between to create the hollow effect.
• Second Outer Loop (Bottom Section): The second outer for loop (i = 5 to i >= 1) controls the rows of the bottom section, with the stars forming a hollow inverted triangle.
• Inner Loop 1 (Spaces for Bottom Section): The first inner for loop (j = 5 to j >= i) prints spaces, increasing as the row number decreases.
• Inner Loop 2 (Hollow Stars for Bottom Section): The second inner for loop (k = 1 to k <= (i * 2) - 1) prints stars (*) only at the first and last positions, leaving spaces in between, similar to the top section.
• New Line: printf("\n"); moves the output to a new line after printing each row.

Output :

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