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C Program to Check Prime Number Using Efficient Logic

  Introduction A prime number is a number that has exactly two distinct positive divisors: 1 and itself. In this program, we check whether a given number is prime or not using a simple and efficient logic. This type of program is commonly used in mathematics, competitive programming, and basic algorithm learning for beginners in C programming. Problem Statement The task is to write a C program that determines whether a given integer is a prime number or not. The program takes a single integer input from the user and analyzes its divisibility. If the number has no divisors other than 1 and itself, it should be identified as a prime number; otherwise, it is not prime. This problem is important in number theory and has practical relevance in areas such as cryptography, data validation, and algorithm design.  Algorithm / Logic Explanation To check whether a number is prime, we need to verify that it is not divisible by any number other than 1 and itself. The algorithm follows a si...
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C program to check if a given string is a palindrome or not using a custom function

Palindrome Checker in C

🔁 Palindrome Check in C (Using Custom Function)

#include<stdio.h>
#include<string.h>

void pal(char str[])
{
    int left = 0, right = strlen(str) - 1;
    while (left < right)
    {
        if (str[left] != str[right])
        {
            printf("No, Entered string is not palindrome:\n");
            return;
        }
        left++;
        right--;
    }
    printf("Yes, Entered string is palindrome:\n");
}

int main()
{
    char str[100];
    printf("Enter the string:\n");
    scanf("%[^\n]", str);
    pal(str);
}

📘 Explanation:

🔹 The function `pal()` compares characters from the start and end moving toward the center.
🔹 If a mismatch is found, the string is not a palindrome.
🔹 The `scanf("%[^\n]", str)` reads a full line including spaces.
🔹 This logic is case-sensitive and does not ignore spaces or punctuation.

🧪 Sample Output:

Enter the string:
madam
Yes, Entered string is palindrome:

Enter the string:
hello
No, Entered string is not palindrome:

🏷️ Keywords:

C palindrome program, check palindrome in C, string comparison, string reverse logic, C interview program, custom function for palindrome check

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