Question

How to sum two binary strings in C

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char* strrev(char* str) {
    char *p1, *p2;
 
    if (!str || !*str)
        return str;
 
    for (p1 = str, p2 = str + strlen(str) - 1; p2 > p1; ++p1, --p2) {
        *p1 ^= *p2;
        *p2 ^= *p1;
        *p1 ^= *p2;
    }
 
    return str;
}

void toBinary(int number, char binaryNumber[]) {
    int i = 0;
 
    while (number != 0) {
        binaryNumber[i] = (number % 2) + '0';
        i++;
        number /= 2;
    }
 
    strrev(binaryNumber);
}

void addBinaryStrings(char* a, char* b, char binaryNumber[]) {
    int num1 = strtol(a, NULL, 2);
    int num2 = strtol(b, NULL, 2);
    
    int sum = num1 + num2;
    
    toBinary(sum , binaryNumber);
}

int main() {
    char* a = "11";
    char* b = "1";
    char binaryNumber[16] = {'\0'};
    
    addBinaryStrings(a, b, binaryNumber);
    printf("%s\n", binaryNumber);
    
    a = "1010";
    b = "1011";
    addBinaryStrings(a, b, binaryNumber);
    printf("%s\n", binaryNumber);
    
    return 0;
}

 
    
    
/*
run:
    
100
10101
 
*/

 

70+ SQL courses for beginners and professionals