Binary to Hexadecimal Conversion in C

October 15, 2026

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 ...

✅ Binary to Hexadecimal Conversion in C

#include<stdio.h>
int main( )
{
    int num, hexa = 0, remainder, j = 1;
    printf("Enter the binary number:\n");
    scanf("%d", &num);
    while(num != 0)
    {
        remainder = num % 10;
        hexa = hexa + remainder * j;
        j = j * 2;
        num = num / 10;
    }
    printf("The hexadecimal value is %X\n", hexa);
}

📘 Explanation:

This C program converts a binary number (input as an integer) to its hexadecimal equivalent. The binary number is first converted to its decimal form manually using bit-weight multiplication (base 2 logic). The resulting decimal is then printed in hexadecimal using the format specifier %X.

🧾 Sample Output:

Enter the binary number:
1010
The hexadecimal value is A

🔑 Keywords:

Binary to Hexadecimal, C Program for Hex Conversion, base conversion in C, Hexadecimal output, %X format specifier, scanf printf in C

📌 Hashtags:

#CProgramming #BinaryToHex #HexadecimalConversion #BaseConversion #PrintfFormat #BeginnerCCode #BitwiseLogic

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