String Manipulation

It's easy to find tutorials on c++ but "c" is not as easy.

I'm looking for any tutorials on string mainpulation in c. I have a large text area (a long string) and I need to search for a unique 4-letter combination and then strip out everything after the trailing spaces.

example:
"123 64 grg 765 myval364 jgfk34"
I need to grab myval364.

I can do this in c++ but I don't know much about c. Again, any tutorials would be great.

Thanks.

Use strtok.

Quote:

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I need to search for a unique 4-letter combination and then strip out everything after the trailing spaces.

example:
"123 64 grg 765 myval364 jgfk34"
I need to grab myval364.

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Where is the "unique 4-letter combination" in that string ?

I'll assume then whatever string manipulation I can do in c++, I can do in c with the same key words?

use strstr.
assume anything watever you want after all its your assumption.But dont assume your assumption will be right.atmost wat will happen just an error.then make a new assumption ;)

thanks, I'll assume this will all work out. :)

oops, my fault on the "4-char" and then I give myval364 as an example.

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Originally Posted by FoodDude

example:
"123 64 grg 765 myval364 jgfk34"
I need to grab myval364.

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How are you determining myval364 is what you need? The 5th word in the string? something beginning with myval?

I'm personally confused, although it seems like you already got what you need, so nevermind.

one last thing. c++ has std::string. Does c have strings or am I limited to chars?

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Does c have strings or am I limited to chars?

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Yes, you're pretty much limited to manipulating zero-terminated char arrays. With the standard C functions at least.

your best friends in C are strstr() which someone else has already mentioned. Then if you want to delete that string, use memmove() to move everything from one spot to another.
Example:

Code:

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int len;
char* ptr;
char str[] = "123 64 grg 765 myval364 jgfk34";
// find text to be removed
ptr = strstr(str,"myval364");
if(ptr != 0)
{
        len = strlen(ptr+8);
  // the string exists,
  memmove(ptr, ptr+8,strlen(ptr+8));
  // now null-terminate the string
  ptr[len] = 0;
}

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a briefer way to do it uses strcpy().

Code:

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char str[] = "123 64 grg 765 myval364 jgfk34";
// find text to be removed
char *ptr = strstr(str,"myval364");
if(ptr != 0)
{
  // the string exists, so delete it
  strcpy(ptr, ptr+8);
}

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Quote:

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a briefer way to do it uses strcpy().

Code:

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char str[] = "123 64 grg 765 myval364 jgfk34";
// find text to be removed
char *ptr = strstr(str,"myval364");
if(ptr != 0)
{
  // the string exists, so delete it
  strcpy(ptr, ptr+8);
}

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http://www.lira.dist.unige.it/teachi...files/man2.pdf

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DESCRIPTION
The strcpy() function copies the string pointed to by src (including the terminating `\0' character) to the
array pointed to by dest. The strings may not overlap, and the destination string dest must be large
enough to receive the copy.

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