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C Program to Display Prime Numbers Between Intervals Using Function

In this example, you will learn to print all prime numbers between two numbers (entered by the user).

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To understand this example, you should have the knowledge of the following C programming topics:


To find all the prime numbers between the two integers, checkPrimeNumber() is created. This function checks whether a number is prime or not.


Prime Numbers Between Two Integers

#include int checkPrimeNumber(int n); int main() { int n1, n2, i, flag; printf("Enter two positive integers: "); scanf("%d %d", &n1, &n2); printf("Prime numbers between %d and %d are: ", n1, n2); for (i = n1 + 1; i < n2; ++i) { // flag will be equal to 1 if i is prime flag = checkPrimeNumber(i); if (flag == 1) printf("%d ", i); } return 0; } // user-defined function to check prime number int checkPrimeNumber(int n) { int j, flag = 1; for (j = 2; j <= n / 2; ++j) { if (n % j == 0) { flag = 0; break; } } return flag; }

Output

Enter two positive integers: 12
30
Prime numbers between 12 and 30 are: 13 17 19 23 29

If the user enters the larger number first, this program will not work as intended. To solve this issue, you need to swap the numbers first.

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