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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 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;
}

📘 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.

🧾 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.

🔑 Keywords:

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

📌 Hashtags:

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

🔍 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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