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Solve LeetCode 3 Longest Substring Without Repeating Characters in C++ using the sliding window

Longest Substring Without Repeating Characters in C++ LeetCode 3 · sliding window · last index array Table of Contents Problem Statement Approach 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 Conclusion Problem Statement 3. Longest Substring Without Repeating Characters Given a string s , find the length of the longest substring that contains no repeating characters. A substring is a continuous part of the string, so "pwke" is a subsequence of "pwwkew" but not a substring. Approach We use a sliding window . The window is the part of the string between start and end , and we always keep it free of repeated characters. An array lastIndex of size 128 remembers the most recent position of every ASCII ...
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Octal to Hexadecimal Conversion in C

Octal to Hexadecimal Conversion in C

#include<stdio.h>

int main()
{
    int num;
    printf("Enter any octal number:\n");
    scanf("%o", &num);
    printf("Hexadecimal value is: %X\n", num);

    return 0;
}

📘 Explanation:

This C program converts an octal number into its hexadecimal equivalent using format specifiers.

  • The %o format specifier in scanf() reads an octal number.
  • The compiler internally converts the octal value into decimal.
  • The %X format specifier in printf() prints the value in hexadecimal (uppercase).
  • No manual conversion logic is required.

This is a simple and efficient way to convert octal to hexadecimal in C.

🧾 Sample Output:

Enter any octal number:
17
Hexadecimal value is: F

🔑 Keywords:

octal to hexadecimal in C, scanf format specifier, number system conversion, hex conversion in C, C programming basics

📌 Hashtags:

#CProgramming #OctalToHexadecimal #NumberSystem #CLanguage #CodingBasics #1printf

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