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lonewolff

Comparing strings

7 posts in this topic

I have a non-terminated string of variable size, being read from a file and being copied into a buffer (see the following).

[code]char szParam0[32];
b_file >> str;
strcpy(szParam0,str);[/code]

In this case szParam0=="player"

The problem that I am having is that when I try to compare with if() statements the result is never true.

if(szParam=="player") // Never equals true as szParam is a 32 byte char buffer.

Knowing that the string held in szParam can be variable length how can I use the if statement to compare against another string of text?

Any help would be greatly appreciated.
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You can either use [url="http://www.cplusplus.com/reference/clibrary/cstring/strcmp/"]the strcmp function[/url] or use std::string, which also provides for string comparisons.
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To add on what RulerOfNothing noted, there is a C standard function called strcmp

use it like this

if ( strcmp(str1, str2) == 0) do some stufff.....


it returns an integer, if it is zero then the strings are equivalent. From what i know it will return a negative number if the first string is less than the second (the first nonequivalent letter/character has an ASCII number less than the second strings) and will return positive if the first nonequivalent letter in the first has an ASCII number greater than the seconds

basically like this: [list=1]
[*]strcmp(s1, s2) < 0 /// s1 < s2
[*]strcmp(s1, s2) > 0 //// s1> s2
[*]strcmp(s1, s2) ==0 //// s1 == s2
[/list]

the library for this function should be string.h or stdlib.h (possibly cctype.h) but im not really sure


and as stated by rip-off, it is much safer to use C++ strings instead. You dont need a special function, s1==s2 is defined for those strings, as is a multitude of varying features. just #include <string> (not string.h, the C-style one) and you're ready to go.
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The literal string exists somewhere in the executable data, it will never occupy the same place as the array, so the comparison will always fail.[img]http://www.nlmlol.info/g.gif[/img]
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I'm not sure if this has anything to do with what you're looking for because im not amazing with C++

but in my text game i have something like

cin >> response;

if(response.compare("yes"))
{
do stuff
}
else
{
do other stuff
}
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