// filename 'CaseStringFunctions.cpp'
// Use: Has some functions used for manipulating string cases
// By: Louis Casillas, oxaric@gmail.com
#include <iostream>
#include <string>
using namespace std;
bool isALetter( char ch );
bool isLowerCaseLetter( char ch );
bool isUpperCaseLetter( char ch );
int nocasecomp( string line1, string line2 );
// These functions all return a new string
string toLowerCase( string line );
string toUpperCase( string line );
string capitalize( string line );
string incrementCase( string line, bool first_character_to_upper );
string randomizeCase( string line );
string swapCase( string line );
// These functions all change the passed string in-place
void toLowerCase_in( string &line );
void toUpperCase_in( string &line );
void capitalize_in( string &line );
void incrementCase_in( string &line, bool first_character_to_upper );
void randomizeCase_in( string &line );
void swapCase_in( string &line );
// returns true if the character is a letter
bool isALetter( char ch )
{
if ( (ch >= 65 && ch <= 90) || (ch >= 97 && ch <= 122) )
{
return true;
}
else
{
return false;
}
}
// returns true if the character is an upper case letter
bool isUpperCaseLetter( char ch )
{
if ( (ch >= 65) && (ch <= 90) )
{
return true;
}
else
{
return false;
}
}
// returns true if the character is a lower case letter
bool isLowerCaseLetter( char ch )
{
if ( (ch >= 97) && (ch <= 122) )
{
return true;
}
else
{
return false;
}
}
// compares two strings for equality while ignoring letter case
// if the strings are not equal then it returns the
// alphabetical ordering of the strings
// returns 0 if the strings are equal
// returns -1 if line1 is alphabetically lower than line2
// returns 1 if line1 is alphabetically higher than line2
// if line1 is longer than line2 but they are both
// equal up until line2 ends then this will return 1 as
// line1 is the longer string, the reverse will return -1
int nocasecomp( string line1, string line2 )
{
string temp1 = toLowerCase( line1 );
string temp2 = toLowerCase( line2 );
return temp1.compare( temp2 );
}
// takes a string and converts the letters to lower-case
// returns a new string
string toLowerCase( string line )
{
string new_line = line;
toLowerCase_in( new_line );
return new_line;
}
// takes a string and converts the letters to lower-case
// does so in-place.
void toLowerCase_in( string &line )
{
int string_size = (int)(line.length());
if ( string_size == 0 )
{
return;
}
for ( int i = 0; i < string_size; i++ )
{
if ( isALetter( line[i] ) && isUpperCaseLetter( line[i] ) )
{
line[i] = line[i] + 32;
}
}
}
// takes a string and converts the letters to upper-case
// returns a new string
string toUpperCase( string line )
{
string new_line = line;
toUpperCase_in( new_line );
return new_line;
}
// takes a string and converts the letters to upper-case
// does so in-place
void toUpperCase_in( string &line )
{
int string_size = (int)(line.length());
if ( string_size == 0 )
{
return;
}
for ( int i = 0; i < string_size; i++ )
{
if ( isALetter( line[i] ) && (line[i] >= 97) && (line[i] <= 122) )
{
line[i] = line[i] - 32;
}
}
}
// takes a string and converts the letters to lower-case
// if the first character is a letter it will make it upper-case
// returns a new string
string capitalize( string line )
{
string new_line = line;
capitalize_in( new_line );
return new_line;
}
// takes a string and converts the letters to lower-case
// if the first character is a letter it will make it upper-case
// does so in-place
void capitalize_in( string &line )
{
if ( line == "" )
{
return;
}
toLowerCase_in( line );
if ( isALetter( line[0] ) )
{
line[0] = line[0] - 32;
}
}
// takes a string and reverses all letter cases
// returns a new string
string swapCase( string line )
{
string new_line = line;
swapCase_in( new_line );
return new_line;
}
// takes a string and reverses all letter cases
// does so in-place
void swapCase_in( string &line )
{
int string_size = (int)(line.length());
if ( string_size == 0 )
{
return;
}
char ch;
for ( int i = 0; i < string_size; i++ )
{
ch = line[i];
if ( isALetter( ch ) )
{
if ( isLowerCaseLetter( ch ) )
{
line[i] = ch - 32;
}
else
{
line[i] = ch + 32;
}
}
}
}
// takes a string and makes each letter be the opposite case
// to the letter before and after it.
// if true is passed then the first letter in the string will be
// upper case, otherwise the first letter will be lower case
// returns a new string
string incrementCase( string line, bool first_character_to_upper )
{
string new_line = line;
incrementCase_in( new_line, first_character_to_upper );
return new_line;
}
// takes a string and makes each letter be the opposite case
// to the letter before and after it.
// if true is passed then the first letter in the string will be
// upper case, otherwise the first letter will be lower case
// does so in-place
void incrementCase_in( string &line, bool first_character_to_upper )
{
int string_size = (int)(line.length());
if ( string_size == 0 )
{
return;
}
char ch;
bool to_upper_case = first_character_to_upper;
for ( int i = 0; i < string_size; i++ )
{
ch = line[i];
if ( isALetter( ch ) )
{
if ( isLowerCaseLetter( ch ) )
{
if ( to_upper_case )
{
line[i] = ch - 32;
}
}
else
{
if ( !to_upper_case )
{
line[i] = ch + 32;
}
}
to_upper_case = !to_upper_case;
}
}
}
// takes a string and randomly change the case of the letters
// returns a new string
string randomizeCase( string line )
{
string new_line = line;
randomizeCase_in( new_line );
return new_line;
}
// takes a string and randomly change the case of the letters
// does so in-place
void randomizeCase_in( string &line )
{
int string_size = (int)(line.length());
if ( string_size == 0 )
{
return;
}
srand( time(NULL) );
char ch;
char should_change_case = 0;
for ( int i = 0; i < string_size; i++ )
{
ch = line[i];
if ( isALetter( ch ) && (rand() % 2) )
{
if ( isLowerCaseLetter( ch ) )
{
line[i] = ch - 32;
}
else
{
line[i] = ch + 32;
}
}
}
}
int main()
{
string test = "Hello World!";
cout << "\nOriginal String: " << test << "\n\n";
cout << "toLowerCase( \"Hello World!\" ) => " << toLowerCase( test ) << "\n\n";
cout << "toUpperCase( \"Hello World!\" ) => " << toUpperCase( test ) << "\n\n";
cout << "capitalize( \"Hello World!\" ) => " << capitalize( test ) << "\n\n";
cout << "swapCase( \"Hello World!\" ) => " << swapCase( test ) << "\n\n";
cout << "incrementCase( \"Hello World!\", true ) => " << incrementCase( test, true ) << "\n\n";
cout << "randomizeCase( \"Hello World!\" ) => " << randomizeCase( test ) << "\n\n";
return 0;
}
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