strcmp函數(shù)是比較兩個(gè)字符串的大小,返回比較的結(jié)果。一般形式是：
i=strcmp(字符串，字符串);
①字符串1小于字符串2,strcmp函數(shù)返回一個(gè)負(fù)值;
②字符串1等于字符串2,strcmp函數(shù)返回零;
③字符串1大于字符串2,strcmp函數(shù)返回一個(gè)正值;
strcpy函數(shù)用于實(shí)現(xiàn)兩個(gè)字符串的拷貝。一般形式是：
strcpy（字符中1,字符串2)
其中,字符串1必須是字符串變量,而不能是字符串常量。strcpy函數(shù)把字符串2的內(nèi)容完全復(fù)制到字符串1中,而不管字符串1中原先存放的是什么。復(fù)制后，字符串2保持不變。

Example of strcmp

/* STRCMP.C */

#include <string.h>
#include <stdio.h>

char string1[] = "The quick brown dog jumps over the lazy fox";
char string2[] = "The QUICK brown dog jumps over the lazy fox";

void main( void )
{
char tmp[20];
int result;
/* Case sensitive */
printf( "Compare strings:\n\t%s\n\t%s\n\n", string1, string2 );
result = strcmp( string1, string2 );
if( result > 0 )
strcpy( tmp, "greater than" );
else if( result < 0 )
strcpy( tmp, "less than" );
else
strcpy( tmp, "equal to" );
printf( "\tstrcmp: String 1 is %s string 2\n", tmp );
/* Case insensitive (could use equivalent _stricmp) */
result = _stricmp( string1, string2 );
if( result > 0 )
strcpy( tmp, "greater than" );
else if( result < 0 )
strcpy( tmp, "less than" );
else
strcpy( tmp, "equal to" );
printf( "\t_stricmp: String 1 is %s string 2\n", tmp );
}

Output

Compare strings:
The quick brown dog jumps over the lazy fox
The QUICK brown dog jumps over the lazy fox

strcmp: String 1 is greater than string 2
_stricmp: String 1 is equal to string 2

Example of Strcpy

/* STRCPY.C: This program uses strcpy
* and strcat to build a phrase.
*/

#include <string.h>
#include <stdio.h>

void main( void )
{
char string[80];
strcpy( string, "Hello world from " );
strcat( string, "strcpy " );
strcat( string, "and " );
strcat( string, "strcat!" );
printf( "String = %s\n", string );
}

Output

String = Hello world from strcpy and strcat!

strcmp是比較2個(gè)字符串，如果一樣的話，就等于0.如果第一個(gè)大于第二個(gè)就為1，都則就為-1.
strcpy是復(fù)制字符串。將達(dá)爾戈字符串復(fù)制到第一個(gè)中去。

這兩個(gè)函數(shù)都是字符串操作函數(shù)。strcmp(char *str1,char *str2)是比較兩個(gè)字符串,如果str1<str2返回負(fù)數(shù)，str1=str2返回0, str1>str2返回正數(shù)。strcpy(char *str1,char *str2)是復(fù)制字符串str2的內(nèi)容到str1中。

strcmp 對(duì)2個(gè)字符串str1,str2進(jìn)行比較 是一個(gè)字符一個(gè)字符的進(jìn)行比較
返回結(jié)果 大小比較
<0 str1 小于str2
= 0 str1 等于str2
> 0 str1 大于str2
strcpy (str2,str1) 是復(fù)制字符str1 到str2 并且在字符串str2后面加字符串結(jié)束符'\0'