A pitfall in the use of strcmp Functions

According to Baidu Encyclopedia: http://baike.baidu.com/view/1026924.htm?introduction

Prototype: extern int strcmp (const char * S1, const char * S2 );

Header file: String. h

Function: Compares S1 and S2 strings.

General Format: strcmp (string 1, string 2)

Note:

When S1 <S2, the return value is-1.

When S1 = S2, the return value is 0.

When S1> S2, the return value is 1.

Note: C ++ Medium

When S1 <S2, the return value is less than 0.

When S1 = S2, the return value is equal to 0.

When S1> S2, the return value is greater than 0.

 

Note that this function returns 1 or-1 in C and is less than 0 or greater than 0 in C ++. It is not set to 1 or-1.

An error occurs if the comparison is performed based on the C interface and 1 and-1.Remember

To be compatible with C, it is best to use a value greater than 0 and less than 0, instead of comparing it with 1-1.