strcmp 使用说明

function
http://www.cplusplus.com/reference/clibrary/cstring/strcmp/

strcmp

<cstring>

int strcmp ( const char * str1, const char * str2 );

Compare two strings

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.

Parameters

str1

C string to be compared.

str2

C string to be compared.

Return Value

Returns an integral value indicating the relationship between the strings:
A zero value indicates that both strings are equal.
A value greater than zero indicates that the first character that does not match has a greater value instr1 than instr2; And a value less than zero indicates the opposite.

Example

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/* strcmp example */#include <stdio.h>#include <string.h>int main (){  char szKey[] = "apple";  char szInput[80];  do {     printf ("Guess my favourite fruit? ");     gets (szInput);  } while (strcmp (szKey,szInput) != 0);  puts ("Correct answer!");  return 0;}

Output:

Guess my favourite fruit? orangeGuess my favourite fruit? appleCorrect answer!