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c#comma-operator

Assignment many variable separated by comma in one line. C#

Sorry for this stupid question, but I can't find answer for it. So, why I can't write code like this in C#:

int a = 10, b = 20, c = 30, d = 40;    
a = b, c = d;

In C++ I can write it and it will be ok.

Why it doesn't compile in C#?

Solution

  • You can write the first line. That is allowed in C#, and spelled out in section 8.5.1 of the C# Language Spec, where it shows that each local-variable-declarator can be in a list that's comma separated:

    local-variable-declarators:
    local-variable-declarator
    local-variable-declarators   ,   local-variable-declarator

    However, C# does not have a comma operator like C++, so you have to split the second line:

    int a = 10, b = 20, c = 30, d = 40; 
a = b;
c = d;