🚀 Programming Example

C Program - Prime Numbers Between Two Integers

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💻 Practical Program

📘 Step Learning

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

💻 Program Code

#include <stdio.h>

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)
    {
        // i is a prime number, flag will be equal to 1
        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;
}

🖥 Program Output

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

📘 Explanation

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

🎯 How to learn from this example

First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.

🔥 Practice suggestion

Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.

C Program - Prime Numbers Between Two Integers

💻 Program Code

🖥 Program Output

📘 Explanation

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