Star Patterns
C program to print hollow diamond star pattern
Write a C program to print hollow diamond star pattern series of n rows using for loop. How to print hollow diamond star pattern structure in C program. Logic to print hollow diamond star pattern in C programming.
Example
Input
Input N: 5
Output
********** **** **** *** *** ** ** * * * * ** ** *** *** **** **** **********
Required knowledge
Basic C programming, For loop, Nested loop
Logic to print hollow diamond star pattern
The pattern seems to be one of the complex pattern to think. To make it easier, let us bisect in two halves.
********** **** **** *** *** ** ** * * * * ** ** *** *** **** **** **********
Here in the upper part of the pattern, trailing and leading stars are inverted right triangle pattern that can be easily printed. Each row contains 2*rownumber - 2 spaces.
Moving on to the second half, if you look at the trailing and leading stars you will find that both of them are right triangle star pattern and total number of spaces per row is 2*rownumber - 2.
Program to print hollow diamond star pattern
/** * C program to print hollow diamond star pattern */ #include <stdio.h> int main() { int i, j, n; printf("Enter value of n : "); scanf("%d", &n); // Loop to print upper half of the pattern for(i=1; i<=n; i++) { for(j=i; j<=n; j++) { printf("*"); } for(j=1; j<=(2*i-2); j++) { printf(" "); } for(j=i; j<=n; j++) { printf("*"); } printf("\n"); } // Loop to print lower half of the pattern for(i=1; i<=n; i++) { for(j=1; j<=i; j++) { printf("*"); } for(j=(2*i-2); j<(2*n-2); j++) { printf(" "); } for(j=1; j<=i; j++) { printf("*"); } printf("\n"); } return 0; }
Output
Enter value of n : 5
********** **** **** *** *** ** ** * * * * ** ** *** *** **** **** **********