# C program to print exponentially increase star pattern

• 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.

For a exponentially increasing star pattern. Program’s output should be: #### Required Knowledge

• For Loop
• printf and scanf function in C

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 Kth row is equal to 2K. 0th row contains 1 star, 1st row contains 2 stars, 3rd row contains 3 stars. In general, Kth row contains 2K 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 Kth row of pattern, inner loop will iterate 2k 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
*
**
****
********
****************