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void printString(string source)
{
	for (int i = 0; i < source.length(); i++) 
		cout  << source[i];
	cout << endl;
}
 
void printHex(string source)
{
	for (int i = 0; i < source.length(); i++) 
		cout  << hex << uppercase << (int)(unsigned char) (source.c_str()[i]) << ' ';
	cout << endl;
}
 

prog.cpp:1:18: error: variable or field 'printString' declared void
 void printString(string source)
                  ^
prog.cpp:1:18: error: 'string' was not declared in this scope
prog.cpp:8:15: error: variable or field 'printHex' declared void
 void printHex(string source)
               ^
prog.cpp:8:15: error: 'string' was not declared in this scope

Standard output is empty