不使用+号添加两个数字

Question

我9年级,我的数学老师让我+在C程序中使用登录添加数字.

我试过, a - (-b) = a + b;但我的数学老师想要一些其他的选择.

Answer 1

在c程序中使用此功能

int Add(int a, int b)
{
    while (b)
    {
        // carry now contains common set bits of "a" and "b"
        int carry = a & b;

        // Sum of bits of "a" and "b" where at least one of the bits is not set
        a = a ^ b;

        // Carry is shifted by one so that adding it to "a" gives the required sum
        b = carry << 1;
    }
    return a;
}

Answer 2

使用按位^和&运算符和递归

int add(int x, int y){
    return y == 0 ? x : add( x ^ y, (x & y) << 1);
}

PS:它是vikas提出的算法的递归版本.

Answer 3

使用Anti Log()你可以做到这一点

Temp= Anti Log(a)* Anti Log(b);

a+b value is equals to log(Temp);

适用于不是双精度的整数.

Answer 4

在Java中使用递归 -

public static int add(int a, int b){

    if(b == 0) return a;
    int sum = a ^ b;
    int carry = (a & b) << 1;

    return add(sum, carry);

}

在C-

int add(int a, int b){

    if(b == 0) return a;
    int sum = a ^ b;
    int carry = (a & b) << 1;

    return add(sum, carry);
}