**C program to display prime numbers between given interval** has been shown here. For example, the prime numbers between 10 and 20 are 11, 13, 17, 19. In this program, the upper and lower bounds of the interval are taken as inputs.

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## 1. C Program & output to display prime numbers between given interval

Code has been copied

/********************************************************** alphabetacoder.com C program to display prime numbers between given intervals ***********************************************************/ #include <stdio.h> #include <math.h> // function to check prime int check_prime(int num) { // declare variables int i; // no prime number less than 2, so return false if (num < 2) return 0; // check divisibility of num for (i = 2; i <= sqrt(num); i++) { if (num % i == 0) { return 0; // num is composite so return false } } // num is prime so return true return 1; } int main() { // declare variables int n1, n2, i; // take input of the inteval printf("Enter the lower and upper bounds of interval = "); scanf("%d %d", & n1, & n2); printf("Prime numbers between %d and %d: ", n1, n2); // find primes between n1 and n2 for (i = n1; i <= n2; i++) { // check if current number is prime if (check_prime(i)) { printf("%d ", i); } } return 0; }

Output

Enter the lower and upper bounds of interval = 10 30

Prime numbers between 10 and 30: 11 13 17 19 23 29

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