将int赋给C中的char时会发生什么？它总是忽略左边的额外位吗？
示例(4个字节int):
unsigned char c = 0;
unsigned int i = 500;
c = i; // c is 244
c = i << 24 >> 24; //c is 244
i = i << 24 >> 24; //i is 244
在二进制中,500是111110100和244是11110100.