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Defined in header <string.h> | ||
int strcmp(constchar* lhs,constchar* rhs); | ||
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 asunsignedchar) that differ in the strings being compared.
The behavior is undefined iflhs orrhs are not pointers to null-terminated byte strings.
Contents |
| lhs, rhs | - | pointers to the null-terminated byte strings to compare |
Negative value iflhs appears beforerhs in lexicographical order.
Zero iflhs andrhs compare equal.
Positive value iflhs appears afterrhs in lexicographical order.
This function is not locale-sensitive, unlikestrcoll andstrxfrm.
#include <stdio.h>#include <string.h> void demo(constchar* lhs,constchar* rhs){constint rc= strcmp(lhs, rhs);constchar* rel= rc<0?"precedes": rc>0?"follows":"equals";printf("[%s] %s [%s]\n", lhs, rel, rhs);} int main(void){constchar* string="Hello World!"; demo(string,"Hello!"); demo(string,"Hello"); demo(string,"Hello there"); demo("Hello, everybody!"+12,"Hello, somebody!"+11);}
Output:
[Hello World!] precedes [Hello!][Hello World!] follows [Hello][Hello World!] precedes [Hello there][body!] equals [body!]
| compares a certain amount of characters of two strings (function)[edit] | |
(C95) | compares two wide strings (function)[edit] |
| compares two buffers (function)[edit] | |
| compares two strings in accordance to the current locale (function)[edit] | |
C++ documentation forstrcmp | |
