c++ primer plus 习题答案(1)

c++ primer plus 习题答案用的是第五版，IDE仍然是vs2013。我只标注了题号，具体的题目找下书上对应内容吧。

p110.8

 #include<iostream>

 #include<string>

 #include<cstring>

 char* getname(char*);

 struct pissza {

     char *pt;

     int diameter;

     int weight;

 };

 using namespace std;

 int main(void){

     pissza will;

     getname(will.pt);

     cout << "enter a diameter\n";

     cin >> will.diameter;

     cout << "enter a weight\n";

     cin >> will.weight;

     cout << will.pt << " has a pissza " << will.diameter

         << " m " << will.weight << " g\n";

     cin.get();

     cin.get();

     return ;

 }

 char* getname(char*pt){

     char name[];

     cout << "enter a name\n";

     cin.getline(name, );

     pt = new char[strlen(name) + ];

     strcpy(pt, name);

     return pt;

 }

p180.2

 #include<iostream>

 #include<ctime>

 #include<cstdlib>

 int main(void){

     using namespace std;

     int i, j, count=, sum = , pt[];

     double mean;

     for (i = ; i < ; i++){

         if (!(cin >> pt[i]))

             break;

         sum += pt[i];

     }

     mean = sum / i;

     for (j = ; j <= i; j++)

         if (pt[j]>mean)

             count++;

     cout << "mean is " << mean << endl;

     cout << "there " << count << " exceed mean\n";

     int time=;

     clock_t delay = time* CLOCKS_PER_SEC;

     clock_t start = clock();

     while (clock() - start < delay)

         continue;

     return ;

 }

p181.7

 #include<iostream>

 #include<cstdlib>

 #include<cctype>

 #include<string>

 using namespace std;

 int main(){

     string word;

     int vowel = , con = , other=;

     while (cin >> word && word != "q"){

         if (isalpha(word[]))

             switch (word[]){

             case 'A':

             case 'a':

                 vowel++;

                 continue;

             case 'E':

             case 'e':

                 vowel++;

                 continue;

             case 'I':

             case 'i':

                 vowel++;

                 continue;

             case 'O':

             case 'o':

                 vowel++;

                 continue;

             case 'U':

             case 'u':

                 vowel++;

                 continue;

             default: con++;

         }

         else other++;

     }

     cout << vowel << "words beginning with vowels\n";

     cout << con << "words beginning with consonants\n";

     cout << other << "others\n";

     system("pause");

     return ;

 }

p181.8

 #include<iostream>

 #include<cstdlib>

 #include<cctype>

 #include<string>

 #include<fstream>

 using namespace std;

 int main(){

     string name;

     cout << "enter the file name\n";

     getline(cin, name);

     ifstream inFile;

     inFile.open(name);

     if (!inFile.is_open()){

         cout << "can't open the file\n";

         exit(EXIT_FAILURE);

     }

     char ch;

     int count = ;

     inFile >> ch;

     while (inFile.good()){

         count++;

         inFile >> ch;

     }

     if (inFile.eof())

         cout << "reading completed successfully\n";

     else if (inFile.fail())

         cout << "reading terminated by data dismatch\n";

     if (count == )

         cout << "no data processed\n";

     else

         cout << "count is " << count << endl;

     inFile.close();

     system("pause");

     return ;

 }