A string initialized to @:@
A string initialized to 20:20
n = 20 atoi(n) = 20 atof(n) = 20
+is = Hello
z = x + y = Helloworld
x += y; x = Helloworld
y.insert (0, x); y = Helloworld
z = x.substr (2, 3) = llo
x.replace (2, 2, r); x = Hero
x.replace (0, 1, 'j'); x = jello
+x = jeHelloo
enter a word:word =abcdefghijklmnopqrstuvwxyz length = 26
End of test