Very simple question...annalyze strings

Hey,

I know this is basic but its the only thing I need to have my program working for school!

I have a char buff[512].

Theres a possibility the first characters might be "exit" ... with a possibility of other stuff behind it.

I need to know IF the first four characters are "exit".

How do I do that?

Simple question, sorry!

Thanks :)

You can compare each of the first four characters, or you can use strncmp.

A simple way to do it:

Code:

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if(buff[0]=='e' && buff[1]=='x' && buff[2]=='i' && buff[3]=='t') {
        //Do something
}

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As tabstop said probably u could use strncmp. Follg is the code thou a littl longer I guess

Code:

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char exit_ca[5];
memset(exit_ca, 0x00, 5);
strncpy(exit_ca, "exit", 5);

if(ZERO == strncmp(buff, exit_ca, strlen(exit_ca)))
{
 printf("first four characters are exit");
}

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Quote:

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Originally Posted by vandrea

Code:

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char exit_ca[5];
memset(exit_ca, 0x00, 5);
strncpy(exit_ca, "exit", 5);

---

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Your array is too small.


Quzah.

Quote:

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Your array is too small.

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quzah i did not get your point. isnt 5 sufficient since we would store only exit and a null character at the end , i thought it would be enough?

Yeah, I was too tired. I thought the word exit had five letters for some reason. :D (I'd been up for like 30 hours so, that's my excuse!)


Quzah.

Code:

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Hi,
You can use the c++ method  strncmp()!

char exit[5] = "exit";

if(!strncmp(buff, exit, 4))
{
      cout << "the first four characters are "exit"!";
}

Carle
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