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Compiler Warning (level 1) C4218

Error Message

nonstandard extension used : must specify at least a storage class or a type

With the default Microsoft extensions (/Ze), you can declare a variable without specifying a type or storage class. The default type is int.


// C4218.c
// compile with: /W4
i;  // C4218

int main()

Such declarations are invalid under ANSI compatibility (/Za).