C# byte相加及short相加竟然是int

今天做了將short相加的動作

ex.

short s1 = 1;

short s2 = 5;

short s3 = s1 + s2;             // 編譯不過

int s4 = s1+ s2;                 // ok

short s5 = (short)(s1 + s2); // ok

byte b1 = 1;

byte b2 = 2;

byte b3 = b1 + b2;             // 編譯不過

int b4 = b1+ b2;                 // ok

byte b5 = (byte)(b1 + b2);   // ok

 

原因是C# 會將 short 或 byte的四則運算轉置為int

所以相加之後 要記得做強行轉換