Write a C program to print a series of hollow squares or rectangles (*) using a for loop. How to print an hollow square star or rectangle pattern of N lines using programming.
for loop logic to print an empty square star or rectangle pattern in a C program.
Logic
input
Enter the number of lines: 5
exit
***** * * * * * * *****
Logic to print hollow square star pattern
The pattern above is similar to the square star pattern of N rows and N columns. Here the star is printed only for the first and last column or for the first and last row.
Step-by-step descriptive logic for printing a blank square star pattern.
1. Enter the number of lines to be printed from the user. Store it in a variable, for example N.
2. Run an outer loop from 1 to N to iterate through the rows. Define the for(i=1; i<=N; i++) structure for this loop.
3. Run an inner loop from 1 to N to iterate over the columns. Define a loop with the structure for(j=1; j<=N; j++).
4. Inside the inner loop, type an asterisk for the first and last row or the first and last column. Which, if i==1, i==N, j==1, or j==N, will output
an asterisk, otherwise a space.
5. After printing all the columns of a row, go to the next row, i.e. print an empty row after the inner loop.
/** * Program in c to show hollow square star pattern */ #include <stdio.h> int main() { int i, j, N; /* accept number of rows as input from user */ printf("\nEnter number of rows:\n "); scanf("%d", &N); /* Iterate through each row */ for(i=1; i<=N; i++) { /* Iterate through each column */ for(j=1; j<=N; j++) { if(i==1 || i==N || j==1 || j==N) { /* print the star for 1st Nth column and row */ printf("*"); } else { printf(" "); } } /* Move to the next line/row */ printf("\n"); } return 0; }
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