Question

A simple for statement would be:

 for(int i = 0/*A Optional*/; i < 10/*B Optional*/; i++/*C Optional*/) {
 }

Now how many variables can I initialize in the initialization code(A) of the for statement?
Also how would I initialize these variables in the initialization code(A) of the for statement?

Answer 1

As many as you care to write, but declaration is restricted to the same type. (For just initialization see the expansion below and Wugs answer.)

for (int a = 1, b = 2, c = 3 ; ; ) {
    break;
}

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The (optional) ForInit section can be:

1. If the ForInit code is a list of statement expressions (§14.8), the expressions are evaluated in sequence from left to right; their values, if any, are discarded.

2. If the ForInit code is a local variable declaration, it is executed as if it were a local variable declaration statement (§14.4) appearing in a block.

3. If the ForInit part is not present, no action is taken.

The example code above with declarations is of the form for(LocalVariableDeclaration;;).