**Example:**

Input lower limit: 10

Input upper limit: 50

Output prime numbers between 10-50 are: 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47

### Required knowledge

Basic C programming, Function, Prime numbersIf you have gone through my previous posts you probably know how to check whether a number is prime or not and also how to find all prime numbers between 1 to n using loops and checking whether a number is prime or not using function. If you haven't then it is highly recommended to go through above posts.

### Program to find all prime numbers between two given intervals using functions

/** * C program to list all prime number between an interval using function. */ #include <stdio.h> /* Function declarations */ int isPrime(int num); void printPrimes(int lowerLimit, int upperLimit); int main() { int lowerLimit, upperLimit; printf("Enter the lower and upper limit to list primes: "); scanf("%d%d", &lowerLimit, &upperLimit); //Calls the function to print all primes between the given range. printPrimes(lowerLimit, upperLimit); return 0; } /** * Prints all prime numbers between an interval defined by lower limit and upper * limit. */ void printPrimes(int lowerLimit, int upperLimit) { printf("All prime number between %d to %d are: ", lowerLimit, upperLimit); while(lowerLimit <= upperLimit) { //Checks whether the current number is prime or not. if(isPrime(lowerLimit)) { printf("%d, ", lowerLimit); } lowerLimit++; } } /** * Checks whether a number is prime or not. Returns 1 if the number is prime * otherwise returns 0. */ int isPrime(int num) { int i; for(i=2; i<=num/2; i++) { /* * If the number is divisible by any number * other than 1 and self then it is not prime */ if(num%i == 0) { return 0; } } return 1; }

Output

Enter the lower and upper limit to list primes: 10 50

All prime number between 10 to 50 are: 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47,

All prime number between 10 to 50 are: 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47,

Happy coding ;)

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