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// 67. Add Binary
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char *addBinary(char *a, char *b) {
int i = strlen(a), j = strlen(b), carry = 0;
int k = i > j ? i : j;
char *ans = malloc(k + 2);
ans[k + 1] = '\0';
while (i || j) {
if (i)
carry += (a[--i] - '0');
if (j)
carry += (b[--j] - '0');
ans[k--] = (carry & 1) + '0';
carry >>= 1;
}
ans[0] = carry + '0';
return ans + (carry ^ 1);
}
int main() {
char a1[] = "11", b1[] = "1";
char a2[] = "1010", b2[] = "1011";
printf("%c\n" * addBinary(a1, b1)); // expect: 100
printf("%c\n" * addBinary(a2, b2)); // expect: 100
}
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