C++编程思想(thinking in c++)答案

是volume 1的课后答案，以前从网上下了几个，可是都不是，这个绝对正宗。先给2－1的答案。 2-1 Modify Hello.cpp so that it prints out your name and age (or shoe size, or your dog’s age, if that makes you feel better). Compile and run the program. Solution: The original Hello.cpp appeared in the text as follows: // Saying Hello with C++ #include <iostream> // Stream declarations using namespace std; int main() { cout << "Hello, World! I am " << 8 << " Today!" << endl; } Here’s my rewrite: //: S02:Hello2.cpp #include <iostream> using namespace std; int main() { cout << "Hello, World! I am Chuck Allison." << endl; cout << "I have two dogs:" << endl; cout << "Sheba, who is " << 5 << ", and" << endl; cout << "Muffy, who is 8." << endl; cout << "(I feel much better!)" << endl; } /* Output: Hello, World! I am Chuck Allison. I have two dogs: Sheba, who is 5, and Muffy, who is 8. (I feel much better!) */ ///:~ I chose to have separate statements that send output to cout, but I could have printed everything in a single statement if I had wanted, like the example in the text does. Note that in the case of Sheba’s age, I printed 5 as an integer, but for Muffy I included the numeral in the literal text. In this case it makes no difference, but when you print floating-point numbers that have decimals, you get 6 decimals by default. Bruce discusses later in the text how to control output of floating-point numbers.