C program to print triangle patterns of stars

Write a C program to print triangle patterns of stars.

 
This post covers below patterns formed by right-angled triangle and its mirror

 


 

Pattern 1: Right-angled Triangle



* * 
* * * 
* * * * 
* * * * * 

This is one of the most basic and easiest pattern. We can have n rows. 1st row will contain 1 star, 2nd row will contain 2 stars, and so on.. We can use two nested loops to print this pattern where outer loop represents row number (say i) and inner loop simply prints the star pattern i times.

C

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Pattern 2: Mirror of Right-angled Triangle


             * 
          *  * 
       *  *  * 
    *  *  *  * 
 *  *  *  *  * 

Suppose we have n rows. Here, 1st row will contain (n-1) spaces followed by 1 star, 2nd row will contain (n-2) spaces followed by 2 stars, and so on.. We can use nested loops to print this pattern where outer loop represents row number (say i) and inner loop prints the space (n-i times) followed by the star pattern (i times).

C

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Pattern 3: Hollow Right-angled Triangle



* * 
*   * 
*     * 
* * * * * 

The idea remains same as Pattern 1 but here we print ‘*’ only for last row and first & last positions for each row. For all other positions, we print space.

C

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Pattern 4: Mirror of Hollow Right-angled Triangle


             * 
          *  * 
       *     * 
    *        * 
 *  *  *  *  * 

Here the idea remains the same as Pattern 2 but we print ‘*’ only for last row and first & last cell in each row. All other positions will be filled by spaces.

C

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Thanks for reading.




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