C program to print a hollow Equilateral Triangle

Program:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

/**  * C program to print hollow pyramid or hollow equilateral triangle star pattern  */ #include <stdio.h> int main() {     int i, j, n;     //Reads number of rows to be printed from user     printf("Enter value of n : ");     scanf("%d", &n);     for(i=1; i<=n; i++)     {         //Prints trailing spaces         for(j=i; j<n; j++)         {             printf(" ");         }         //Prints hollow pyramid         for(j=1; j<=(2*i-1); j++)         {             if(i==n || j==1 || j==(2*i-1))             {                 printf("*");             }             else             {                 printf(" ");             }         }         printf("\n");     }     return 0; }

Output

X

≡

_

Enter value of n: 5 
    *
   * *
  *   *
 *     *
*********