Write code to print prime numbers in a right-angle triangle format.

Question

Accepted Answer

Code to print prime numbers in right angle triangle format.

Create a function to check if a number is prime or not.
Use nested loops to print the numbers in right angle triangle format.
Start with the first prime number and keep adding prime numbers to the triangle.
Example: 2 3 5 7 11 13 17 19 23 29

Accepted Answer

// in C

#include

int isPrimeNumber(int num);

int main() {

int i, j, rows;

int counter = 2;

printf("Enter the number of rows ");

scanf("%d", &rows);

for (i = 1; i <= rows; i++) {

for (j = 1; j <= i; j++) {

/* Try to find next prime number by

incrementing counter and testing it for primality */

while(!isPrimeNumber(counter)){

counter++;

}

printf("%d ", counter);

counter++;

}

printf(" ");

}

return(0);

}

int isPrimeNumber(int num) {

int i, isPrime = 1;

for (i = 2; i <= (num/2); i++) {

if (num % i == 0){

isPrime = 0;

break;

}

if (isPrime==1 || num==2)

return 1;

else

return 0;

}

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