operator question in c

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I am trying in c

C++

main()
{
    int a=5;
    a=a++ + ++a + a++ + ++a + ++a;
    printf("%d",a);
}

I am trying more expression with it but not sufficient answer. so what is the method
for solve this type of expression. how gcc compiler work with this type of expression.
please

Posted 29-Aug-12 10:38am

praveen kumar 96

Updated 29-Aug-12 10:43am

André Kraak

v2

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2 solutions

Solution 2

With most decent compilers your code is equivalent to this:

C++

main()
{
    int a=5;

    ++a; ++a; ++a;          // perform prefix increment/decrement instructions
    // a == 8
    a=a + a + a + a + a;    // execute the statement without increment/decrement operators
    // a == 40
    a++; a++;               // perform postfix increment/decrement instructions
    // a == 42

    printf("%d",a);
}

However I wouldn't be surprised if the C standard didn't define the value of a after running this terrible piece of code. Don't write such crap. I have never seen similar code in practice.

Posted 29-Aug-12 13:56pm

pasztorpisti

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JackDingler · Accepted Answer · 2012-08-29T10:49:00

Left to right order, multiple passes...
Prefix operators first.
Postfix operators last.

And for extra credit...
Some compilers are buggy in this regard. It can be dangerous to write code in this form. In the real world, never do this. Always break such operations down into constituent parts, so you don't risk losing your job over a compiler bug.