C Program to Print Prime Number Series in a Given Range दी गई Range में Prime Number Series प्रिंट करने का C प्रोग्राम

A prime number is a number greater than 1 that is divisible only by 1 and itself. This program prints all prime numbers between the lower and upper limits entered by the user.

Prime Number वह संख्या होती है जो 1 से बड़ी हो और केवल 1 तथा स्वयं से विभाजित होती हो। यह प्रोग्राम यूजर द्वारा दी गई Lower Limit और Upper Limit के बीच सभी Prime Numbers प्रिंट करता है।

C Program

#include <stdio.h>

int main(void) {
    int ll, ul, n, i, isPrime;
    int found = 0;

    printf("Enter Lower Limit and Upper Limit:\n");

    if (scanf("%d%d", &ll, &ul) != 2) {
        printf("Invalid input! Please enter two integers.\n");
        return 1;
    }

    if (ll > ul) {
        printf("Wrong range! Lower limit must be less than or equal to upper limit.\n");
        return 1;
    }

    printf("Prime numbers between %d and %d are:\n", ll, ul);

    for (n = ll; n <= ul; n++) {
        if (n < 2)
            continue;

        isPrime = 1;

        for (i = 2; i * i <= n; i++) {
            if (n % i == 0) {
                isPrime = 0;
                break;
            }
        }

        if (isPrime) {
            printf("%d ", n);
            found = 1;
        }
    }

    if (found == 0) {
        printf("No prime numbers found in the given range.");
    }

    printf("\n");
    return 0;
}

Sample Output 1

Enter Lower Limit and Upper Limit:
10 30
Prime numbers between 10 and 30 are:
11 13 17 19 23 29

Sample Output 2

Enter Lower Limit and Upper Limit:
8 10
Prime numbers between 8 and 10 are:
No prime numbers found in the given range.

Explanation

The variable found is initialized to 0. When a prime number is found, the program prints it and sets found = 1.

After checking the entire range, if found is still 0, the program prints the message that no prime numbers were found.

found वेरिएबल को शुरुआत में 0 रखा जाता है। जब कोई Prime Number मिलता है, तो प्रोग्राम उसे प्रिंट करता है और found = 1 कर देता है।

यदि पूरी Range चेक करने के बाद भी found का मान 0 रहता है, तो प्रोग्राम बताता है कि दी गई Range में कोई Prime Number नहीं मिला।

Modern C Compatibility Note

This program uses standard C and works with modern compilers such as GCC, Clang, and Visual Studio C. It does not require conio.h, clrscr(), or getch().

This program prints prime numbers in a given range and displays a message if no prime number is found.

यह प्रोग्राम दी गई Range में Prime Numbers प्रिंट करता है और कोई Prime Number न मिलने पर उचित संदेश दिखाता है।