function argument

What is the below highlighted code intended to do ? Why don't 开发者_JAVA百科we not use the arguments at all ?

int fun( int a, int b)
{
    (void) a; // <<<
    (void) b; // <<<

    printf("Hello World\n");
}

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It's a way of preventing the compiler from warning about "unused parameters". It doesn't actually consume anything (the expression is discarded).