Skip to main content

Featured

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...
Post a Comment
Read more
Labels

Check Palindrome and Reverse String in C

Check Palindrome and Reverse String in C

✅ Check Palindrome and Reverse a String in C

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

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

// Function to reverse the string
void reverse(char str[]) {
    int start = 0, end = strlen(str) - 1;
    while (start < end) {
        char temp = str[start];
        str[start] = str[end];
        str[end] = temp;
        start++;
        end--;
    }
}

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

    printf("Before Reversing: %s\\n", str);
    pal(str);              // Check palindrome before reversing
    reverse(str);
    printf("After Reversing: %s\\n", str);

    return 0;
}

📘 Explanation:

✅ This program reads a string from the user.
✅ It first checks whether the input string is a palindrome by comparing characters from both ends.
✅ If the string is not a palindrome, it notifies the user.
✅ Then it reverses the string using a two-pointer method and prints the reversed result.
✅ It uses strlen, scanf, and character swapping.

🧾 Sample Output:

Enter the string:
madam
Before Reversing: madam
Yes, Entered string is a palindrome.
After Reversing: madam

🔑 Keywords:

Palindrome check C, reverse string in C, C string programs, string palindrome logic, two pointer technique, string manipulation

📌 Hashtags:

#CProgramming #PalindromeCheck #ReverseString #StringHandling #BeginnersC #InterviewPrep #StringFunctions

Labels:

Comments

Post a Comment

Popular Posts

🌙