Shulou(Shulou.com)06/03 Report--

What this article shares with you is about the implementation of string class functions. The editor thinks it is very practical, so I share it with you. I hope you can get something after reading this article. Let's take a look at it with the editor.

Char * strcpy (char * strDest, const char * strSrc)

{

If (strDest = = NULL | | strSrc = = NULL)

Return 0

Char * address = strSrc

While (* strDest++ = * strSrc++)! ='\ 0')

NULL

Return addressl

}

/ / string comparison function, equality returns 0 quotient S1 returns positive integer, S2 returns negative integer

Int mystrcmp (const char * S1 Const char * S2)

{

While (* s _ 1 / s _ 1x _ r _ 0 _ r _ 2 _ r _ r

Return (* S1)-(* S2)

}

/ / string length function, excluding the'/ 0' at the end

Int mystrlen (const char * s)

{

Int res = 0

While (* slotted trees)

Res++

Return res

}

/ / string concatenation function

Char * mystrcat (char * source,const char * dest)

{

If (source = = NULL

| | dest = = NULL)

Return 0

Char * s = source

While (* sails after raceme) slots +

While (* destabilized automobile racer 0') * swarm + = * dest++

* slots, please beat 0'.

Return source

}

/ / string conversion lowercase letter function

Char * mystrlwr (char * source)

{

Char * s = source

Do

{

If (* s > = 'A'&&*s='a'&&*s

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