Question

How to convert hexadecimal number to binary in C++

Answer 1

#include <iostream>

using namespace std;
 
const char *hex_char_to_binary(char ch) {
    switch (toupper(ch)) {
        case '0': return "0000";
        case '1': return "0001";
        case '2': return "0010";
        case '3': return "0011";
        case '4': return "0100";
        case '5': return "0101";
        case '6': return "0110";
        case '7': return "0111";
        case '8': return "1000";
        case '9': return "1001";
        case 'A': return "1010";
        case 'B': return "1011";
        case 'C': return "1100";
        case 'D': return "1101";
        case 'E': return "1110";
        case 'F': return "1111";
    }
    return "";
}

string hex_to_binary(const string &hex) {
    string binary;
    
    for (int i = 0; i != hex.length(); i++)
       binary += hex_char_to_binary(hex[i]);
       
    return binary;
} 

int main() {
	char hex[10] = "1BC"; 
  
    cout << hex_to_binary(hex); 
}


/*
run:

000110111100

*/

 

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