The strcmp compares two strings character by character. If the first character of two strings is equal, the next character of two strings are compared. This continues until the corresponding characters of two strings are different or a null character '0' is reached. It is defined in the string.h header file. Jul 03, 2009 if you're using std::string, you don't need strcmp, you can just use strcmp is for c-style strings (char arrays). Strcmp in C/C. The function strcmp is a built-in library function and it is declared in “string.h” header file. This function is used to compare the string arguments. It compares strings lexicographically which means it compares both the strings character.
Conclusion – strcmp in C String compare is also one form of predefined inbuild functions of string.h header file as part of the string class. There are many forms and syntaxes to represent the same, but the main advantage is to compare an array of char in any form of a string that can be used internally for comparison of characters up to null characters. Compares the C string str1 to the C string str2. This function starts comparing the first character of each string. If they are equal to each other, it continues with the following pairs until the characters differ or until a terminating null-character is reached. This function performs a binary comparison of the characters.
|Standard Library Headers|
|Freestanding and hosted implementations|
|Language support library|
|Regular expressions library(C++11)|
|Atomic operations library(C++11)|
|Thread support library(C++11)|
|Conversions to numeric formats|
Defined in header
Compares two null-terminated byte strings lexicographically.
The sign of the result is the sign of the difference between the values of the first pair of characters (both interpreted as unsignedchar) that differ in the strings being compared.
The behavior is undefined if
rhs are not pointers to null-terminated strings.
|lhs, rhs||-||pointers to the null-terminated byte strings to compare|
Negative value if
lhs appears before
rhs in lexicographical order.
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rhs compare equal.
Positive value if
lhs appears after
rhs in lexicographical order.
| compares a certain number of characters from two strings |
| compares two wide strings |
| compares two buffers |
| compares two strings in accordance to the current locale |
C documentation for strcmp
strcmp() is a built-in library function and is declared in <string.h> header file. This function takes two strings as arguments and compare these two strings lexicographically.
In the above prototype, function srtcmp takes two strings as parameters and returns an integer value based on the comparison of strings.
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What does strcmp() return?
This function can return three different integer values based on the comparison:
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