an empty string: A string initialized to Hello:Hello A string initialized to previous string:Hello A string initialized to (previous string, 1, 2):el 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 x = x + y + x; x = HelloworldHello x = y + x + x; x = worldHelloHello z = x + s + + y.substr (y.find (w), 1) + y.substr (y.find (w) + 1) + . = Hello, world. ch = x[0] = H 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