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#include <iostream.h>#include <conio.h>#include <string.h>int GetNumberofLetters( char* szString ){     int iLen = ( int )strlen( szString );     int iNum = 0;     for( int i = 0; i >= iLen; i++ )     {          if( ( szString[i] >= 'a' && szString[i] <= 'z' )          || ( szString[i] >= 'A' && szString[i] <= 'Z' ) )          {               iNum++;          }     }     return iNum;}int main(){	main_loop:	char cName[99];	int iLength;	cout<<"Enter your name ";	cin>>cName;	iLength = GetNumberofLetters( ( char* )cName );	if( iLength < 1 )goto wrong;	cout << "The number of letters in your name is "<< iLength;	getch();	return 0;	wrong:	MessageBox( 0, "Input only letters please.", "ERROR", MB_OK );	goto main_loop;}