In this article we will show you, How to write a C Program to Print Hollow Rectangle Star Pattern with example. And also show you, How to print hollow rectangle pattern with different symbols.
C Program to Print Hollow Rectangle Star Pattern
This C program allows the user to enter the number of rows, and columns to design hollow rectangle. This value will decide the number of rows, and columns of a hollow rectangle. Here, we are going to print the stars until it reaches to the user specified rows, and columns.
CODE
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/* C Program to Print Hollow Rectangle Star Pattern */ #include<stdio.h> int main() { int i, j, rows, columns; printf("Please Enter the Number of rows:\n"); scanf("%d", &rows); printf("Please Enter the Number of Columns:\n"); scanf("%d", &columns); for(i = 0; i < rows; i++) { for(j = 0; j < columns; j++) { if(i == 0 || i == rows-1 || j == 0 || j == columns-1) { printf("*"); } else { printf(" "); } } printf("\n"); } return 0; } |
OUTPUT
ANALYSIS
Let us see the Nested for loop
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for(i = 0; i < rows; i++) { for(j = 0; j < columns; j++) { if(i == 0 || i == rows-1 || j == 0 || j == columns-1) { printf("*"); } else { printf(" "); } } printf("\n"); } |
Outer Loop – First Iteration
From the above screenshot you can observe that, The value of i is 0 and Rows is 7 so, the condition (i < 5) is True. So, it will enter into second for loop
Inner Loop – First Iteration
The j value is 0 and the condition (j < 15) is True. So, it will start executing the statement inside the loop. So, it will enter into the If Statement. Here, we are checking whether i = 0, j = 0, i = 6 (rows – 1) , or j = 14 (columns – 1). If any of this condition is true then following statement will print *. It means, Only first column, and last column in each row will be printed as output, and remaining columns will be printed as empty space.
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printf("*"); |
This will happen until it reaches to 7 and after that both the Inner Loop and Outer loop will be terminated.
C Program to Print Hollow Rectangle Pattern with Dynamic Character
This C program allows the user to enter the Symbol that he/she want to print as hallow rectangle pattern.
CODE
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/* C Program to Print Hollow Rectangle Star Pattern */ #include<stdio.h> int main() { int i, j, rows, columns; char Ch; printf("Please Enter any Symbol: "); scanf("%c", &Ch); printf("\nPlease Enter the Number of rows: "); scanf("%d", &rows); printf("\nPlease Enter the Number of Columns: "); scanf("%d", &columns); for(i = 1; i <= rows; i++) { for(j = 1; j <= columns; j++) { if(i == 1 || i == rows || j == 1 || j == columns) { printf("%c", Ch); } else { printf(" "); } } printf("\n"); } return 0; } |
OUTPUT
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