5.9编程练习

练习1

#include <iostream>using namespace std;int main(){ int one,two,sum=0; cout << "Please input two integer/n" "First one:"; cin >> one; cout << "Second one:"; cin >> two; cout << "You've input " << one << " and " << two << endl; for (int i=one;i<=two;i++) sum+=i; cout << "The summary of all integer nums between them is equal to " << sum << endl; return 0;}

 

练习2

#include <iostream>using namespace std;int main(){ float num,sum=0; cout << "Input number, exit by enter 0/n" "Enter your number: "; cin >> num; while(num!=0) { sum+=num; cout << "Sum of all numbers: " << sum << endl; cout << "Enter your number, 0 to exit: "; cin >> num; } cout << "bye!"; return 0;}

 

练习3

#include <iostream>int main(){ using namespace std; float Daphne_deposit,Cleo_deposit; int year=0; float Daphne_interest=0.1,Cleo_interest=0.05; Daphne_deposit=Cleo_deposit=100; Daphne_interest=Daphne_deposit*Daphne_interest; while (Daphne_deposit>=Cleo_deposit) { Daphne_deposit+=Daphne_interest; Cleo_deposit*=1+Cleo_interest; ++year; } cout << "After " << year << " years, Cleo's investment " << Cleo_deposit << " is larger than Daphne's " << Daphne_deposit; return 0;}

 

练习4

#include <iostream>using namespace std;int main(){ string month[]={"January","February","March","April","May","June","July","August","September","October","November","December"}; int sale[12]={0},sum=0; for (int i=0;i<12;i++) { cout << "Input sales in " << month[i] << ": "; cin >> sale[i]; sum+=sale[i]; } cout << "sales for whole year : " << sum << endl; return 0;}

 

练习5

#include <iostream>using namespace std;int main(){ string month[]={"January","February","March","April","May","June","July","August","September","October","November","December"}; int sale[3][12]={0},sum[3]={0}; for (int j=0;j<3;j++) { for (int i=0;i<12;i++) { cout << "Input sales in " << month[i] << " for the year " << j+1 << " :"; cin >> sale[j][i]; sum[j]+=sale[j][i]; } cout << "sales for whole year " << j+1 << ":" << sum[j] << endl; } cout << "Sales for 3 years: " << sum[0]+sum[1]+sum[2] << endl; return 0;}

 

练习6

#include <iostream>using namespace std;struct car{ std::string manufactory; int madeYear;};int main(){ int ch,i; cout << "How many cars do you wish to catalog?"; (cin >> ch).get(); car *cars=new car[ch]; for (i=0;i<ch;i++) { cout << "Car #" << i+1 << ":/nPlease enter the make: "; getline(cin,cars[i].manufactory); cout << "Please enter the year made: "; (cin >> cars[i].madeYear).get(); } cout << "Here is your collection:/n"; for(i=0;i<ch;i++) cout << cars[i].madeYear << " " << cars[i].manufactory << endl; return 0;}

 

练习7

#include <iostream>#include <cstring>using namespace std;int main(){ cout << "Enter words (to stop, type the word done):/n"; char word[20]; int count=0; cin >> word; while(strcmp(word,"done")) { ++count; cin >> word; } cout << "You entered a total of " << count << " words." << endl; return 0;}

 

练习8

#include <iostream>#include <string>using namespace std;int main(){ cout << "Enter words (to stop, type the word done):/n"; std::string word; cin >> word; int count=0; while (word!="done") { ++count; cin >> word; } cout << "You entered a total of " << count << " words./n"; return 0;}

 

练习9

#include <iostream>using namespace std;int main(){ int row; cout << "Enter number of rows:"; cin >> row; for (int i=0;i<row;i++) { for (int j=i;j<row-1;j++) cout << '.'; for (int j=0;j<i+1;j++) cout << '*'; cout << endl; } return 0;}