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Merge Sort in C++

  Merge Sort in C++ Introduction Merge Sort is a popular sorting algorithm that follows the Divide and Conquer approach. It divides an array into smaller subarrays, recursively sorts those subarrays, and finally merges the sorted subarrays to produce a completely sorted array. In this tutorial, we will learn how to implement Merge Sort in C++ . The program divides the array into two halves using the mid index, recursively sorts both halves, and then combines them using the merge() function. Merge Sort has a time complexity of O(n log n) in the best, average, and worst cases. Table of Contents Algorithm C++ Program Input Sample Output Output Explanation Dry Run Flow of Execution Time Complexity Space Complexity Applications Key Points Interview Questions Frequently Asked Questions Keywords Conclusion Algorithm Start the program. Read the size of the array. Read the array elements from the user. Call the mer...

C Program to Find the Second Last Character of a String

Second Last Character of String in C (scanf) - No Newline Handling

✅ C Program to Find the Second Last Character of a String (Clean scanf Version)

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

int main() {
    char str[100];

    printf("Enter a string: ");
    scanf("%[^\n]", str);  // Reads until newline, no need to handle '\n'

    int len = strlen(str);

    if (len < 2) {
        printf("String is too short to have a second last character.\n");
    } else {
        printf("Second last character: %c\n", str[len - 2]);
    }

    return 0;
}
  

๐Ÿ“˜ Explanation:

This program reads a string from the user using scanf("%[^\n]"), which captures input until the newline character but does not include it in the string.

  • It directly uses strlen() to find the length of the input.
  • If the string has fewer than 2 characters, a warning is displayed.
  • Otherwise, str[len - 2] gives the second last character.
  • No need for additional newline removal logic in this version.

๐Ÿงพ Sample Output:

Enter a string: Hello World
Second last character: l

Enter a string: H
String is too short to have a second last character.
  

๐Ÿ”‘ Keywords:

scanf string C, second last character, strlen example, no newline handling, C string logic, interview question, clean code C

๐Ÿ“Œ Hashtags:

#CProgramming #StringIndexing #strlen #scanfInput #InterviewCode #BeginnerFriendly

๐Ÿ” Search Description:

Clean and efficient C program to find the second last character in a string using scanf without newline handling. Simple logic using strlen. Great for C beginners.

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