Thread: strcmp???

i have a question guys.. strcmp is short for string compare right? therefore it compare 2 string.. but can strcmp can be also used for character?
like if you are to compare to variable, say A and B, which are declared as char.. would strcmp work?
ex. if (strcmp( A, B) == 0)

no it would not

simply because the arguments to strcmp needs to be char *

if you want to compare variables that are characters simply use the relational operators ==, !=, >, <, >= or <= as you would with integers

Originally Posted by SvNo7

i have a question guys.. strcmp is short for string compare right? therefore it compare 2 string.. but can strcmp can be also used for character?
like if you are to compare to variable, say A and B, which are declared as char.. would strcmp work?
ex. if (strcmp( A, B) == 0)

well if u still wanted to use strcmp to compare two single char. It should be char *

What u could do is

Code:

char str1[2] = {"a"};
char str2[2] = {"a"};
 
if(strcmp(str1,str2_==0)
{}

This is sort of tech which most of the newbie use. But which is not recommended. This is just a way to show you to use it. But still if you wanted to compare two char this would the recommended

Code:

char a ='1';
char b = '1';
 
if(a== b)
{}

your could actually see the difference between those two. In the first method u will have to allocated some same for the null char which basically means u are using one more byte for just one byte. But when u declare it as a char u are using just one byte. NOTE char data type takes one byte most of the time.

ssharish2005

A string has (generally) more than one character. Unless it is a null string, it is not a single character. So comparing single characters using strcmp is not correct.

SvNo7: your example displays nothing relevant, and is potentially disinformation.

If you turn warnings up higher you'll see that strcmp() is undefined because you didn't include <stdlib.h>, and likewise for printf() because <stdio.h> is missing. (Just postulating here.)

If you just want to compare the first character of a string with another character, simply use ==:

Code:

if(astring[0] == achar) {}

If you want to search for a single character inside a string, you can use strchr().

In case you're interested, there are many functions that deal with strings and characters. Here's a list. http://cppreference.com/stdstring/index.html

[edit] Compiling the above code with dinkumware.com/exam:

MINGW/C++:

Code:

sourceFile.cpp: In 
   function `int main()':
sourceFile.cpp:6: `printf' 
   undeclared (first use this function)
sourceFile.cpp:6: (Each 
   undeclared identifier is reported only once for each function it appears 
   in.)
sourceFile.cpp:7: `scanf' 
   undeclared (first use this function)
sourceFile.cpp:9: `strcmp' 
   undeclared (first use this function)
sourceFile.cpp:13:2: warning: no newline at end of file

VC++ v8/C++:

Code:

sourceFile.cpp
sourceFile.cpp(2) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
sourceFile.cpp(6) : error C3861: 'printf': identifier not found
sourceFile.cpp(7) : error C3861: 'scanf': identifier not found
sourceFile.cpp(9) : error C3861: 'strcmp': identifier not found
sourceFile.cpp(10) : error C3861: 'printf': identifier not found

[/edit]