- Write a program in C to print right triangle star (*) pattern of n rows using for loop.
- Write a C program to print a right angles triangle pattern of star (*) character using loops.

#### Required Knowledge

**Algorithm to print exponentially increasing star pattern using loop**

- Take the number of rows(N) of right triangle as input from user using scanf function.
**Number of stars in K**. 0^{th}row is equal to 2^{K}^{th}row contains 1 star, 1^{st}row contains 2 stars, 3^{rd}row contains 3 stars. In general, K^{th}row contains 2^{K}stars.- We will use two for loops to print exponential star pattern.
- For a exponentially increasing star pattern of N rows, outer for loop will iterate N time. Each iteration of outer loop will print one row of the pattern.
- For K
^{th}row of pattern, inner loop will iterate 2^{k}times. Each iteration of inner loop will print one star (*).

Here is the matrix representation of the exponentially increasing star pattern. The row numbers are represented by i whereas column numbers are represented by j.

## C program to print exponentially increasing star pattern

#include<stdio.h> #include<math.h> int main(){ int i,j,rows; printf("Enter the number of rows\n"); scanf("%d", &rows); for(i = 0; i < rows; i++){ /* Prints one row of pattern */ for(j = 0; j < pow(2,i); j++){ printf("*"); } /* move to next row */ printf("\n"); } return 0; }Output

Enter the number of rows 4 * ** **** ******** ****************

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