Binary to Decimal 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 Decimal Conversion in C

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

📘 Explanation:

This program converts a binary number (input as an integer) into its decimal equivalent.
- It extracts each digit (right to left) using modulus and multiplies it by powers of 2.
- The value is added to a `decimal` variable.
- `%d` is used in printf to display the result in decimal format.

🧾 Sample Output:

Enter binary number:
1010
The decimal value is 10

🔑 Keywords:

Binary to Decimal, C Program for Number Conversion, Beginner C Code, scanf printf usage, while loop example, base-2 to base-10

📌 Hashtags:

#CProgramming #BinaryToDecimal #BeginnerCode #NumberConversion #whileLoop #scanf #printf #LogicInC

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