#include <string>
#include <algorithm>
#include <iostream.h>
#include <stdlib.h>
#include <assert.h>
string X = "Hello";
string Y = "world";
string N = "123";
string c;
const char* s = ",";
void decltest()
{
string x;
cout << "an empty string:" << x << "\n";
assert(x == "");
string y = "Hello";
cout << "A string initialized to Hello:" << y << "\n";
assert(y == "Hello");
if (y[y.length()-1] == 'o')
y = y + '\n';
assert(y == "Hello\n");
y = "Hello";
string a = y;
cout << "A string initialized to previous string:" << a << "\n";
assert(a == "Hello");
assert(a == y);
string b (a, 1, 2);
cout << "A string initialized to (previous string, 1, 2):" << b << "\n";
assert(b == "el");
char ch = '@';
string z (1, ch);
cout << "A string initialized to @:" << z << "\n";
assert (z == "@");
string n ("20");
cout << "A string initialized to 20:" << n << "\n";
assert(n == "20");
int i = atoi(n.c_str ());
double f = atof(n.c_str ());
cout << "n = " << n << " atoi(n) = " << i << " atof(n) = " << f << "\n";
assert(i == 20);
assert(f == 20);
int ar[] = { 'H', 'e', 'l', 'l', 'o' };
string is (ar, ar+sizeof(ar)/sizeof(ar[0]));
cout << "is = " << is << endl;
assert (is == "Hello");
}
void cattest()
{
string x = X;
string y = Y;
string z = x + y;
cout << "z = x + y = " << z << "\n";
assert(z == "Helloworld");
x += y;
cout << "x += y; x = " << x << "\n";
assert(x == "Helloworld");
y = Y;
x = X;
y.insert (0, x);
cout << "y.insert (0, x); y = " << y << "\n";
assert(y == "Helloworld");
y = Y;
x = X;
x = x + y + x;
cout << "x = x + y + x; x = " << x << "\n";
assert(x == "HelloworldHello");
y = Y;
x = X;
x = y + x + x;
cout << "x = y + x + x; x = " << x << "\n";
assert(x == "worldHelloHello");
x = X;
y = Y;
z = x + s + ' ' + y.substr (y.find ('w'), 1) + y.substr (y.find ('w') + 1) + ".";
cout << "z = x + s + + y.substr (y.find (w), 1) + y.substr (y.find (w) + 1) + . = " << z << "\n";
assert(z == "Hello, world.");
}
void
findtest()
{
string x;
string::size_type pos;
pos = x.find_last_not_of('X');
assert(pos == string::npos);
pos = x.find_last_not_of("XYZ");
assert(pos == string::npos);
string y("a");
pos = y.find_last_not_of('X');
assert(pos == 0);
pos = y.find_last_not_of('a');
assert(pos == string::npos);
pos = y.find_last_not_of("XYZ");
assert(pos == 0);
pos = y.find_last_not_of("a");
assert(pos == string::npos);
string z("ab");
pos = z.find_last_not_of('X');
assert(pos == 1);
pos = z.find_last_not_of("XYZ");
assert(pos == 1);
pos = z.find_last_not_of('b');
assert(pos == 0);
pos = z.find_last_not_of("Xb");
assert(pos == 0);
pos = z.find_last_not_of("Xa");
assert(pos == 1);
pos = z.find_last_of("ab");
assert(pos == 1);
pos = z.find_last_of("Xa");
assert(pos == 0);
pos = z.find_last_of("Xb");
assert(pos == 1);
pos = z.find_last_of("XYZ");
assert(pos == string::npos);
pos = z.find_last_of('a');
assert(pos == 0);
pos = z.find_last_of('b');
assert(pos == 1);
pos = z.find_last_of('X');
assert(pos == string::npos);
}
void comparetest()
{
string x = X;
string y = Y;
string n = N;
string z = x + y;
assert(x != y);
assert(x == "Hello");
assert(x != z.substr (0, 4));
assert(x.compare (y) < 0);
assert(x.compare (z.substr (0, 6)) < 0);
assert(x.find ("lo") == 3);
assert(x.find ("l", 2) == 2);
assert(x.rfind ("l") == 3);
}
void substrtest()
{
string x = X;
char ch = x[0];
cout << "ch = x[0] = " << ch << "\n";
assert(ch == 'H');
string z = x.substr (2, 3);
cout << "z = x.substr (2, 3) = " << z << "\n";
assert(z == "llo");
x.replace (2, 2, "r");
cout << "x.replace (2, 2, r); x = " << x << "\n";
assert(x == "Hero");
x = X;
x.replace (0, 1, 'j');
cout << "x.replace (0, 1, 'j'); x = " << x << "\n";
assert(x == "jello");
int ar[] = { 'H', 'e', 'l', 'l', 'o' };
x.replace (find (x.begin (), x.end (), 'l'),
find (x.rbegin (), x.rend (), 'l').base (),
ar, ar+sizeof(ar)/sizeof(ar[0]));
cout << "x = " << x << endl;
assert (x == "jeHelloo");
}
void iotest()
{
string z;
cout << "enter a word:";
cin >> z;
cout << "word =" << z << " ";
cout << "length = " << z.length() << "\n";
}
void identitytest(string a, string b)
{
string x = a;
string y = b;
x += b;
y.insert (0, a);
assert((a + b) == x);
assert((a + b) == y);
assert(x == y);
assert((a + b + a) == (a + (b + a)));
x.erase (x.rfind (b));
assert(x == a);
y.replace (0, y.rfind (b), b);
assert(y == (b + b));
y.replace (y.find (b), b.length (), a);
assert(y == (a + b));
}
int main()
{
decltest();
cattest();
comparetest();
findtest();
substrtest();
identitytest(X, X);
identitytest(X, Y);
identitytest(X+Y+N+X+Y+N, "A string that will be used in identitytest but is otherwise just another useless string.");
iotest();
cout << "\nEnd of test\n";
return 0;
}