Strcmp

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strcmp

Image:Farm-Fresh text lowercase.png Note: This function name starts with a lowercase letter.


Description:

Compares two strings to see if they are the same.


Parameters:
(const string1[], const string2[], bool:ignorecase=false, length=cellmax)
string1The first string to compare.
string2The second string to compare.
ignorecase (optional)When set to true, the case doesn't matter - HeLLo is the same as Hello. When false, they're not the same.
length (optional)When this length is set, the first x chars will be compared - doing "Hello" and "Hell No" with a length of 4 will say it's the same string.


Return Values:

0 if strings match each other on given length;
1 o r -1 if some character do not match: string1[i] - string2[i] ('i' represents character index starting from 0);
difference in number of characters if one string matches only part of another string.


Image:32px-Circle-style-warning.png

Important
Notes

  • This function returns 0 if either string is empty. Check for null strings with isnull(). If you do not, for example, people can login to anyone's account by simply entering a blank password.
  • If you compare strings from a text file, you should take in to account the 'carriage return' and 'new line' special characters (\r \n), as they are included, when using fread.


Example Usage: 

new string1[] = "Hello World";
new string2[] = "Hello World";
 
// Check if the strings are the same
if(!strcmp(string1, string2))
 
new string3[] = "Hell";
 
// Check if the first 4 characters match
if(!strcmp(string2, string3, false, 4))
 
// Check for null strings with isnull()
if(!strcmp(string1, string2) && !isnull(string1) && !isnull(string2))
 
// Definition for isnull():
#if !defined isnull
    #define isnull(%1) ((!(%1[0])) || (((%1[0]) == '\1') && (!(%1[1]))))
#endif

Good examples of using strcmp can be found at the Using strcmp()-Tutorial.

Related Functions

The following functions may be helpful as they relate to this function in one way or another.

  • strfind: Search for a string in another string.
  • strtok: Get the next 'token' (word/parameter) in a string.
  • strdel: Delete part of a string.
  • strins: Insert text into a string.
  • strlen: Get the length of a string.
  • strmid: Extract part of a string into another string.
  • strpack: Pack a string into a destination string.
  • strval: Convert a string into an integer.
  • strcat: Concatenate two strings into a destination reference.


External Links

Retrieved from "https://sampwiki.blast.hk/wiki/Strcmp"
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