Example: Binary to Decimal Converter in C

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// Binary to Decimal Converter
#include <stdio.h>
#include <math.h> // For pow() function, though can be avoided with a variable

int main() {
    long long binaryNum;
    int decimalNum = 0, i = 0, remainder;

    // Step 1: Prompt user for input
    printf("Enter a binary number: ");
    scanf("%lld", &binaryNum);

    // Step 2: Iterate through the binary number
    while (binaryNum != 0) {
        remainder = binaryNum % 10; // Get the last digit
        binaryNum /= 10;            // Remove the last digit
        
        // Step 3: Add to decimal equivalent
        // If the digit is 1, add 2^i to decimalNum
        decimalNum += remainder * pow(2, i); 
        
        i++; // Increment the power of 2 for the next digit
    }

    // Step 4: Display the result
    printf("Decimal equivalent: %d\n", decimalNum);

    return 0;
}