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Print Hollow Square Star Pattern

PRINTING PATTERN:

****

*    *

*    *

****

PREREQUISITE:

Basic knowledge of C language and use of loops.

ALGORITHM:

  1. Take number of rows/columns as input from the user (length of side of square) and store it in any variable (‘l’ in this case).
  2. Run  a loop ‘l’ number of times to iterate through all the rows. From i=0 to i<l. The loop should be structured as for( i=0; i<l ; i++).
  3. Run a nested loop inside the main loop for printing stars . From j=0 to j<l. The loop should be structured as for( j=0 ; j<l : j++).
  4. Inside the above loop print stars only if  i=0 or i=l-1 or j=0 or j=l-1 in all other cases print a blank space.
  5. Move to the next line by printing a new line. printf(“\n”).

Code in C:

#include<stdio.h>
int main()
{
int i,j,l;    //declaring integers i,j for loops and l for the number of rows
printf(" Enter the number of rows\n");   //Asking user for input
scanf("%d",&l);   //taking input for number of rows and saving in variable l
for(i=0;i<l;i++) //Outer loop for number of rows
   {
      for(j=0;j<l;j++) //Inner loop for printing stars in each column of a row
         {
            if(i==0 || i==l-1 || j==0 || j==l-1) // condition for printing stars
               {
                  printf("*");   // printing stars
               }
            else                 // else condition to print spaces 
               {
                  printf(" ");   //printing spaces
               }
         }
      printf("\n");       //Printing a new line after a row has been printed
   }
}

TAKING INPUT:
DISPLAYING OUTPUT:

6 comments on “Print Hollow Square Star Pattern”


  • Krishan

    Code in Python3:
    def pattern(n): #here, n = size of the box
    for i in range(1,n+1):
    if i == 1 or i ==n:
    print(n*’*’)
    else:
    print(‘*’+ (n-2)*’ ‘ + ‘*’)


  • Pooja

    def print_rectangle(n, m) :

    for i in range(1, n+1) :
    for j in range(1, m+1) :
    if (i == 1 or i == n or
    j == 1 or j == m) :
    print(“*”, end=””)
    else :
    print(” “, end=””)

    print()

    # Driver program for above function
    rows = 6
    columns = 20
    print_rectangle(rows, columns)


  • Ramya r

    #include

    int main() {
    // Write C code here
    int i,j,n;
    scanf(“%d”,&n);
    for(i=1;i<=n;i++)
    {
    for(j=1;j<=n;j++)
    {
    if(i==1||i==n)
    printf("*");
    else
    if(j==1||j==n)
    printf("* ");
    }
    printf("\n");
    }

    return 0;
    }


  • shreyank

    # Function for Hollow Rhombus

    def hollowRhombus(rows):

    for i in range (1, rows + 1):
    # Print trailing spaces
    print (end=”\n”)

    for j in range (1, rows + 1):
    print (end=””)

    # Print stars after spaces
    # Print stars for each solid rows

    if i == 1 or i == rows:
    for j in range (1, rows + 1):
    print (“*”,end=””)

    # stars for hollow rows
    else:
    for j in range (1,rows+1):
    if (j == 1 or j == rows):
    print (“* “,end=””)
    else:
    print (end=” “)
    # Move to the next line/row
    print()

    # utility program to print all patterns
    def printPattern(rows):
    hollowRhombus(rows)

    # driver program

    if __name__ == “__main__”:

    rows = 4
    printPattern (rows)