Re: C Programming Problem
Well, If I'm not wrong then the answer would be
c = (a++) + (++b)
c = 5 + 8
c = 13
And after the operation a = 6, b = 8, c = 13.
a++ = Post Increment, so the value is increased after the operation performed.
++b = Pre Increment, so the value is incremented before the operation is performed.
Well, If I'm not wrong then the answer would be
c = (a++) + (++b)
c = 5 + 8
c = 13
And after the operation a = 6, b = 8, c = 13.
a++ = Post Increment, so the value is increased after the operation performed.
++b = Pre Increment, so the value is incremented before the operation is performed.
Neuron
Electronic.
Re: C Programming Problem
That's an invalid expression. You'll get a compile time error.
That's an invalid expression. You'll get a compile time error.
nims11
BIOS Terminator
Re: C Programming Problem
because of precedence. the precedence is as follows
expr++ > + > ++expr.
So
a+++++b is equivalent to (a++)+++b
In x+++b '+' operation will be performed first and you can see why it won't be possible here and thus compiler throws an error.
because of precedence. the precedence is as follows
expr++ > + > ++expr.
So
a+++++b is equivalent to (a++)+++b
In x+++b '+' operation will be performed first and you can see why it won't be possible here and thus compiler throws an error.
rijinpk1
Aspiring Novelist
Re: C Programming Problem
The first preceedence is given to post increment(a**).then pre increment(**a). Here Addition is given least priority.a** will be correctly compiled. Then if u do not put paranthesis or space compiler would have confusion to go for preincrement or addition, Since compilation takes from left to right. That is why it is getting wrong for u. I dont think it is compiler's fault. Consider c=a******b. How compiler would consider this? c=(a**)*(**(*b)). Will compiler consider so?
It is ur duty to put paranthesis where ever necessary.
I think I am not wrong.
Post ur suggestions
My plus sign is not printed in my above comment.
So pls consider * instead of plus sign. Sorry for the inconvenience.
The first preceedence is given to post increment(a**).then pre increment(**a). Here Addition is given least priority.a** will be correctly compiled. Then if u do not put paranthesis or space compiler would have confusion to go for preincrement or addition, Since compilation takes from left to right. That is why it is getting wrong for u. I dont think it is compiler's fault. Consider c=a******b. How compiler would consider this? c=(a**)*(**(*b)). Will compiler consider so?
It is ur duty to put paranthesis where ever necessary.
I think I am not wrong.
Post ur suggestions
My plus sign is not printed in my above comment.
So pls consider * instead of plus sign. Sorry for the inconvenience.
Neuron
Electronic.
Re: C Programming Problem
a+++++b;
This line is parsed by the compiler the following way.
1.Operand 'a' is added to the stack.
2.The next operand encountered is '++' .It checks to if there is an lvalue to operate upon.In this case the lvalue is 'a',so no problem and it is added to the stack.
3.The next operand encountered is also '++'. The compiler analyses a statement sequentially, not entirely and so there is no question of analysing the rest of the statement to interpret the operators as '+' and then '++'.Since the operator is a ++ it checks to see if there is an lvalue to operate upon. There's none and hence the error.
Remember 'a+++b' is processed as a++ + b.
If you write a++ + ++b, there is no invalid increment operator.
a+++++b;
This line is parsed by the compiler the following way.
1.Operand 'a' is added to the stack.
2.The next operand encountered is '++' .It checks to if there is an lvalue to operate upon.In this case the lvalue is 'a',so no problem and it is added to the stack.
3.The next operand encountered is also '++'. The compiler analyses a statement sequentially, not entirely and so there is no question of analysing the rest of the statement to interpret the operators as '+' and then '++'.Since the operator is a ++ it checks to see if there is an lvalue to operate upon. There's none and hence the error.
Remember 'a+++b' is processed as a++ + b.
If you write a++ + ++b, there is no invalid increment operator.
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