编程环境Visual Studio 2017
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#include <iostream> #include <string> #include <array> using std::cin; using std::cout; using std::endl; using std::array; using std::string; using std::getline; // practice 1 void p5_1(void) { int number1 = 0; int number2 = 0; int sum = 0; cout << "Enter the first number: "; cin >> number1; cout << "Enter the second number: "; cin >> number2; for (int i = number1; i <= number2; i++) { sum += i; } cout << "The sum of number " << number1 << " to " << number2 << ", sum = " << sum << endl; } // practice 2 const int ArSize = 100; void p5_2(void) { array<long double, ArSize+1> factorials; factorials[0] = factorials[1] = 1.0; for (int i = 2; i <= ArSize; i++) { factorials[i] = i * factorials[i - 1]; } for (int i = 0; i <= ArSize; i++) { cout << i << "! = " << factorials[i] << endl; } return; } // practice 3 void p5_3(void) { int sum = 0; int num = 0; while (1) { cout << "Enter a number( 0 to exit): "; cin >> num; if (num == 0) { break; } sum += num; cout << "Until now, the sum of the number you inputed is " << sum << endl; } cout << "Done." << endl; return; } // practice 4 void p5_4(void) { double Daphne_account = 100; double Cleo_account = 100; int years = 0; while (Daphne_account >= Cleo_account) { years++; Cleo_account = Cleo_account + Cleo_account * 0.05; Daphne_account += 10; } cout << "After " << years << " years. " << "Cleo account which is " << Cleo_account << " will more than Daphne account which is " << Daphne_account << "." << endl; } // practie 5 void p5_5(void) { string month[12] = { "January", "February", "March", "April", "May", "June", "July", "August", "Septempber", "October", "November", "December" }; int sell[12]; int total_sales = 0; cout << "Enter the sales of book <C++ for Fools> each month: " << endl; for (int i = 0; i < 12; i++) { cout << month[i] << ": "; cin >> sell[i]; total_sales += sell[i]; } cout << "The total sales is " << total_sales << endl; for (int i = 0; i < 12; i++) { cout << month[i] << ": " << sell[i] << endl; } return; } // practice 6 void p5_6(void) { string month[12] = { "January", "February", "March", "April", "May", "June", "July", "August", "Septempber", "October", "November", "December" }; unsigned int sales[3][12] = { 0 }; unsigned int total_sales[3] = { 0 }; for (int i = 0; i < 3; i++) { cout << "Enter " << i + 1 << " year(s) sales of book <C++ for Fools> each month: " << endl; for (int j = 0; j < 12; j++) { cout << month[j] << ": "; cin >> sales[i][j]; total_sales[i] += sales[i][j]; } } for (int i = 0; i < 3; i++) { cout << i + 1 << " year(s) total sales is " << total_sales[i] << endl; } cout << "Three years total sales is " << total_sales[0] + total_sales[1] + total_sales[2] << endl; } //practice7 struct car { string company; int pro_year; }; void p5_7(void) { unsigned int size = 0; cout << "How many cars do you wish to catalog? "; cin >> size; cin.get(); struct car *pcar = new struct car[size]; for (unsigned int i = 0; i < size; i++) { cout << "Car #" << i + 1 << ":" << endl; cout << "Please enter the make: "; getline(cin, pcar[i].company); cout << "Please enter the year make: "; cin >> pcar[i].pro_year; cin.get(); } cout << "Here is your collection:" << endl; for (unsigned int i = 0; i < size; i++) { cout << pcar[i].pro_year << " " << pcar[i].company << endl; } } // practice 8 void p5_8(void) { unsigned int n_word = 0; char input[128]; cout << "Enter words (to stop, type the word done):" << endl; while (cin >> input) { if (strcmp(input, "done")) { n_word++; } else break; } cout << "You entered a total of " << n_word << " words." << endl; } // practice 9 void p5_9(void) { unsigned int n_word = 0; string input; cout << "Enter words (to stop, type the word done):" << endl; while (cin >> input) { if (input != "done") { n_word++; } else break; } cout << "You entered a total of " << n_word << " words." << endl; } // practice 10 void p5_10(void) { unsigned int row = 0; cout << "Enter number of rows: "; cin >> row; for (unsigned int i = 1; i <= row; i++) { for (unsigned int j = i; j < row; j++) { cout << "."; } for (unsigned int j = 0; j < i; j++) { cout << "*"; } cout << endl; } } int main(int argc, char **argv) { p5_10(); while (getchar()); return 0; } |
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5.2 array factorials;为什么要用Arsize+1，还有用long long类型为什么不可以啊
不太记得题目意思是否是要打印到100了，如果是的话0-100是101个数；如果使用long long的话100！会超过long long上上限导致溢出，而使用long double可以通过科学记数法表示。就不怕数值溢出