6.11.1
#include<iostream> #include<cctype> int main() { using namespace std; char ch; cin.get(ch); while (ch != '@') { if (isdigit(ch)) cout << ch; else if (isupper(ch)) { ch = tolower(ch); cout << ch; } else if (islower(ch)) { ch = toupper(ch); cout << ch; } cin.get(ch); } }
6.11.2
#include<iostream> #include<cctype> int main() { using namespace std; double donations[10]; double donation; double average, sum = 0; int i, num=0; cout << "input donation,at most 10 "; for (i = 0; (cin >> donation) && (i < 10); i++) { donations[i] = donation; sum += donations[i]; } average = sum / i; for (i = 0; i < 10; i++) { if (donations[i] > average) num++; } cout << "average is " << average << " and " << num << " numbers bigger than avergae."; }
6.11.3
#include<iostream> int main() { using namespace std; char ch; cout << "Please enter one of the following choices: " "c) carnivore p) pianist " "t) tree g) game "; cout << "Please enter a c,p,t,or g:"; cin >> ch; //cout << "A maple is a "; while (ch!='f') { switch (ch) { case'c':cout << "A maple is a carnivore."; break; case'p':cout << "A maple is a pianist."; break; case't':cout << "A maple is a tree."; break; case'g':cout << "A maple is a game."; break; default:cout << "Please enter a c,p,t,or g:"; } cin >> ch; } }
6.11.4
#include<iostream> using namespace std; const int strsize = 20; const int memberSize = 3; struct bop { char fullname[strsize]; char title[strsize]; char bopname[strsize]; int preference; }; void name(bop *member); void title(bop *member); void bopname(bop *menber); void preference(bop *member); int main() { char choose; bop member[3] = { {"zhang","manager","boss",1}, {"li","programer","pg",0}, {"wang","teacher","tc",2} }; cout << "Benevolent Order of Programmers Report " "a.display by name b.display by title " "c.display by bopname d.display by preference " "q.quit " "Enter your choice: "; cin >> choose; while (choose!='q') { switch (choose) { case 'a':name(member); break; case 'b':title(member); break; case 'c':bopname(member); break; case 'd':preference(member); break; default:cout << "Not good choose "; break; } cout << "Next choose:"; cin >> choose; } } void name(bop * member) { for (int i = 0; i < memberSize; i++) { cout << member[i].fullname << endl; } } void title(bop * member) { for (int i = 0; i < memberSize; i++) { cout << member[i].title << endl; } } void bopname(bop * member) { for (int i = 0; i < memberSize; i++) { cout << member[i].bopname << endl; } } void preference(bop * member) { for (int i = 0; i < memberSize; i++) { switch (member[i].preference) { case 0:cout << member[i].fullname << endl; break; case 1:cout << member[i].title << endl; break; case 2:cout << member[i].bopname << endl; break; default: cout << "存在非法的偏好"; break; } } }
6.11.5
#include<iostream> int main() { using namespace std; int money; double tax = 0; cout << "Please input your income: "; cin >> money; cout << fixed; cout.precision(2); cout.setf(ios::showpoint); while (cin.good()&&(money>=0)) { if (money<=5000) { tax = 0.0; break; } else if ((money > 5000) && (money <= 15000)) { tax = (money - 5000)*0.1; break; } else if ((money > 15000) && (money <= 35000)) { tax = (money - 15000)*0.15 + 10000 * 0.1; break; } else { tax = (money - 35000)*0.2 + 20000 * 0.15 + 10000 * 0.1; break; } } cout << "Your personal income tax is " << tax << " tvarps"; }
6.11.6
#include<iostream> #include<string> using namespace std; struct donations { string name; double money; }; int main() { int donorSize, grand_patron_size = 0, patrons_size = 0; cout << "How many people donate？ " "donorSize: "; cin >> donorSize; donations *donor = new donations[donorSize]; donations *grand_patrons = new donations[donorSize]; donations *patrons = new donations[donorSize]; cout << "Please enter donor's contribution amount:" << endl; cout << fixed; cout.precision(2); cout.setf(ios_base::showpoint); for (int i = 0; i < donorSize; i++) { cout << "name:"; cin >> donor[i].name; //cin.get(); //cout << " "; cout << "contribution amout:"; cin >> donor[i].money; } for (int i = 0; i < donorSize; i++) { if (donor[i].money > 10000) { grand_patrons[grand_patron_size] = donor[i]; ++grand_patron_size; } else { patrons[patrons_size] = donor[i]; ++patrons_size; } } cout << "=============== Grand Partrons ================" << endl; if (grand_patron_size != 0) { for (int i = 0; i < grand_patron_size; i++) { cout << "name: " << grand_patrons[i].name << " money:" << grand_patrons[i].money << endl; } } else { cout << "None"; } cout << "================= Partrons ====================" << endl; if (patrons_size != 0) { for (int i = 0; i < patrons_size; i++) { cout << "name: " << patrons[i].name << " money:" << patrons[i].money << endl; } } else { cout << "None"; } delete[] donor; delete[] grand_patrons; delete[] patrons; }
6.11.7
#include<iostream> #include<string> #include<cctype> int main() { using namespace std; int vowel = 0, consonant = 0, other = 0; string word; cout << "Enter word (q to quit): "; cin >> word; while (cin.good() && word != "q") { if (isalpha(word[0])) { switch (word[0]) { case 'a': vowel++; break; case 'A': vowel++; break; case 'e': vowel++; break; case 'E': vowel++; break; case 'i': vowel++; break; case 'I': vowel++; break; case 'o': vowel++; break; case 'O': vowel++; break; case 'u': vowel++; break; case 'U': vowel++; break; default: consonant++; } } else other++; cin >> word; } cout << vowel << " words beginning with vowels." << endl; cout << consonant << " words beginning with consonants." << endl; cout << other << " others."; }
6.11.8
#include<iostream> #include<fstream> #include<cstdlib> #include<string> int main() { using namespace std; ifstream infile; string str; int sum = 0; infile.open("D:\visual studio 2015\Projects\homework\homework\Debug\TextFile1.txt"); if (infile.is_open()) { while (infile.good()) { str += infile.get(); ++sum; } cout << "The file contains " << sum << " characters."; } else { cout << "Failed to read file."; exit(EXIT_FAILURE); } infile.close(); }
6.11.9
#include<iostream> #include<string> #include<fstream> #include<cstdlib> using namespace std; struct donations { string name; double money; }; int main() { int donorSize, grand_patron_size = 0, patrons_size = 0; string donor_information; ifstream infile; infile.open("D:\visual studio 2015\Projects\homework\homework\TextFile2.txt"); if (infile.is_open()) { infile >> donorSize; infile.get(); cout << donorSize << endl; donations *donor = new donations[donorSize]; donations *grand_patrons = new donations[donorSize]; donations *patrons = new donations[donorSize]; cout << fixed; cout.precision(2); cout.setf(ios_base::showpoint); for (int i = 0; i < donorSize; i++) { getline(infile, donor[i].name); infile >> donor[i].money; infile.get(); } for (int i = 0; i < donorSize; i++) { cout << donor[i].name << endl; cout << donor[i].money << endl; } for (int i = 0; i < donorSize; i++) { if (donor[i].money > 10000) { grand_patrons[grand_patron_size] = donor[i]; ++grand_patron_size; } else { patrons[patrons_size] = donor[i]; ++patrons_size; } } cout << "=============== Grand Partrons ================" << endl; if (grand_patron_size != 0) { for (int i = 0; i < grand_patron_size; i++) { cout << "name: " << grand_patrons[i].name << " money:" << grand_patrons[i].money << endl; } } else { cout << "None"; } cout << "================= Partrons ====================" << endl; if (patrons_size != 0) { for (int i = 0; i < patrons_size; i++) { cout << "name: " << patrons[i].name << " money:" << patrons[i].money << endl; } } else { cout << "None"; } delete[] donor; delete[] grand_patrons; delete[] patrons; } else { cout << "Failed to open file."; exit(EXIT_FAILURE); } infile.close(); }