Integer summing blues, short += short problem

Question

Program in C#:

short a, b;
a = 10;
b = 10;
a = a + b; // Error : Cannot implicitly convert type \'int\' to \'short\'.

// we can also write this code by usin         


        

Answer 1

You have to use:

a = (short)(a + b);

As to the difference between the behaviours of assignment and addition assignment, I imagine it has something to do with this (from msdn)

x+=y
is equivalent to
x = x + y
except that x is only evaluated once. The meaning of the + operator is
dependent on the types of x and y (addition for numeric operands, 
concatenation for string operands, and so forth).

However, it's a bit vague, so mabye someone with a deeper understanding can comment.