C++ Primer Plus 第六版 第四章编程练习记录

第4章（VS2013）

3.

#include<iostream>#include<cstring>int main(){using namespace std;char fn[10];cout << "Enter your first name: ";cin >> fn;char ln[10];cout << "Enter your last name: ";cin >> ln;strcat_s(fn, ", ");char he[20];strcpy_s(he,fn);strcat_s(he, ln);cout << "Here's the information in a single string: "<<he << endl;cin.get();cin.get();return 0;}

4.

#include<iostream>#include<string>int main(){using namespace std;string str1, str2;cout << "Enter your first name: ";cin >> str1;cout << "Enter your last name: ";cin >> str2;string str;str = str2 + ", ";str = str + str1;cout << "Here's the information in a single string: " << str << endl;cin.get();cin.get();return 0;}

5.

#include<iostream>struct CandyBar{char kind[20];double weights;int k;};int main(){using namespace std;CandyBar snack = { "Mocha Much", 2.3, 350 };cout << "kind: " << snack.kind << endl;cout << "weights: " << snack.weights << endl;cout << "calorie: " << snack.k << endl;//cin.get();cin.get();return 0;}

6.

#include<iostream>struct CandyBar{char kind[20];double weights;int k;};int main(){using namespace std;CandyBar snack[3] = { { "Mocha Much", 2.3, 350 },{"BuLaoLin",2.0,400},{"DaBaiTu",2.6,300}};for (int i = 0; i < 3; i++){cout << "kind: " << snack[i].kind << endl;cout << "weights: " << snack[i].weights << endl;cout << "calorie: " << snack[i].k << endl;}//cin.get();cin.get();return 0;}

7或8.

#include<iostream>struct Piza{char CompName[20];double d;double weights;};int main(){using namespace std;Piza* p = new Piza;cin.getline(p->CompName,20);cin >> (*p).d;cin >> p->weights;cout << "CompName: " << p->CompName << endl;cout << "d: " << p->d << endl;cout << "weights: " << p->weights << endl;

        delete p;

cin.get();cin.get();return 0;}

9.

#include<iostream>struct CandyBar{char kind[20];double weights;int k;};int main(){using namespace std;CandyBar* p = new CandyBar[3];p[0] = { "Mocha Much", 2.3, 350 };p[1] = { "BuLaoLin", 2.0, 400 };p[2]={"DaBaiTu", 2.6, 300 };for (int i = 0; i < 3; i++){cout << "kind: " << p[i].kind << endl;cout << "weights: " << p[i].weights << endl;cout << "calorie: " << p[i].k << endl;}delete[] p;cin.get();return 0;}

9.

#include<iostream>#include<array>int main(){using namespace std;cout << "Please input thtee grades in seconds\n";array<float, 3>a;cin >> a[0];cin >> a[1];cin >> a[2];cout << "first " << a[0]<<" s"<<endl;cout << "second " << a[1] << " s" << endl;cout << "thred " << a[2] << " s" << endl;cout << "avgave: " << (a[0] + a[1] + a[2]) / 3 <<" s"<< endl;cin.get();cin.get();return 0;}