Question

C program for printing the prime number in triangle form​

Answer 1

#include<stdio.h>

int isPrimeNumber(int num);

int main() {

int i, j, rows;

int counter = 2;

printf("Enter the number of rows\n");

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("\n");

}

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;

}