C ++ character (char) and string (string) Operations

1. Determine whether a string contains non-numeric characters

# Include <string>

 

Bool ischar (string judstr)
{
Char szbuf [2];
While (judstr. Length ()! = 0)
{
Strcpy_s (szbuf, (judstr. substr (0, 1). c_str ());

Int c = (INT) (szbuf [0]);

Judstr = judstr. substr (1, sizeof (judstr) + 1 );

// If any of the string is character, then this string is a character, return true.
If (isalpha (c ))
{
Return true;
}
}
// If all of the string is number, the string is number, return true.
Return false;
}

 

2. Convert all characters in a string to uppercase.

# Include <string>

String uperstring (string Str)
{
Char szbuf [2];
String restr = "";
String temp_word = "";

While (Str. Length ()! = 0)
{

Strcpy_s (szbuf, (Str. substr (0, 1). c_str ());

Int c = (INT) (szbuf [0]);

Temp_word = toupper (C );

STR = Str. substr (1, sizeof (STR) + 1 );

Restr = restr + temp_word;

}

// If all of the string is number, the string is number, return true.
Return restr;
}

3. Convert string to Char

Char szbuf [2];
Strcpy_s (szbuf, (pointer-> word). substr (0, 1). c_str ());