有符号字符转无符号字符

转换成二进制，取其补码即可

#include <iostream>

using namespace std;

int main()
{
    signed char sc=-160;
    unsigned char uc=sc;
    cout<<(int)uc<<endl;//96
    //10100000 160
    //01011111 反码
    //01100000 补码 96
    system("pause");
    return 0;
}

运行结果：