problem with for loop

[JAI SINGH]

int main(void)
{
int x=0;
for(;x;)
{
printf("hello");
}
while(!kbhit());
return 0;
}
output

nothing


int main(void)
{
int x=0;
for(;0;)
{
printf("hello");
}
while(!kbhit());
return 0;
}

output
hello

[Stewbond]

Interesting, they should both output nothing as far as I can see.

[codekiddy]

int x=0;
for(;x;)

this never runs because 0 is false not true.
for loop only runs while condition is true (1 or more)

[JAI SINGH]

let me tell u that technically there is no condidtion in C becoz C language do not have boolean construct


"true" or "false"

[codekiddy]

I have no clue about C programing but I think you are teribly wrong.
I will kick my head off and sh*** down my nech if for loop in C differs from for loop in C++

cheers.

[Moschops]

let me tell u that technically there is no condidtion in C

It is true that the C definition does not contain the word "condition". Nonetheless, ISO/IEC 9899, the official definition of C, indicates throughout its text that false means the same thing as zero, and true the same thing as nonzero.

ISO 14882 2003 (C++03 definition) makes it even clearer: 4.12 "A zero value, null pointer value, or null member pointer value is converted to false; any other value is converted to true."

C++ does use the term condition to describe identical for loops. C may well technically not have conditions, but in non-technical reality, it does.

[JAI SINGH]

@codekiddy no I am not wrong "for" loop in C is totally diffrent from for loop in C++ but on visual studio IDE it takes true or false as condition but in C it does not take true or false as condition..................on any IDE

[codekiddy]

OK!,
big thatnks to Mr. Stroustrup for C++ so we don't have to learn C.

[1vRz3TCk]

JAI SINGH,

There is no semantic difference between the for loops in C and C++. Both the pieces of code posted should produce no output under both C and C++. Weather C compare to Zero or C++ uses a specific boolean type makes no real difference. If you see a difference then please explain further.


P.S. C has had a boolean type since C99, it is in <stdbool.h> (Don't expect to find it in Microsoft's implementation of C, it is not compliant).

[Moschops]

no I am not wrong "for" loop in C is totally diffrent from for loop in C++

Not just wrong, but so wrong that holding such a belief is damaging.

[JAI SINGH]

@CodeMonkey thanx sir


but on IDE TCPP,BORLAND C,and too many others IDE on which I have worked it gives an error

undefined symbol "true" or "false"

so tell me the IDE which support these type of functionalities

[Moschops]

The IDE has nothing to do with it. It is the compiler that matters.

undefined symbol "true" or "false"

False is 0. True is any other number.

[JAI SINGH]

leave the topic condition in C

tell me solution of the problem why it is happening in ?

[Moschops]

The solution is the best way is happening C has yes

[1vRz3TCk]

I'm not entirely sure I understand what you are asking, however:

It is the compiler that is compliant/supports the features, not the IDE. For a list of compliant compilers see: http://en.wikipedia.org/wiki/C99

However if you just want to be able to use Boolean values in C , you could look at defining said values. See: http://c-faq.com/~scs/cgi-bin/faqcat.cgi?sec=bool

Hope it helps.