To add two numbers without using "+" plus sign

//To add two numbers without using "+" plus sign

#include <stdio.h>

int add(int a, int b){
int sum, carry;
sum = a ^ b;
carry = a & b;

while (carry != 0){
carry <<= 1;
a = sum;
b = carry;
sum = a ^ b;
carry = a & b;
}

return sum;
}

void main(){
int answer = add(2,5);
printf("%d\n", answer);
}