近期做的c++练习题

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本文详细解析了CPrimeplus课后的编程练习题，包括数据结构定义、字符串处理、条件判断及循环控制等核心概念的应用。通过实例展示了如何使用C++进行结构体操作、字符串输入输出以及条件循环的实现。

C Prime plus课后练习

 5 - 7


#include<iostream>
#include<cstring>
using namespace std;
typedef struct
{
	string name;
	int year; 
}car;

int main()
{
	cout << "How many do u wish to catalog?";
	int n;
	(cin >> n).get();
	car *c = new car[n + 1];      不 + 1  底下数组就会越界 
	for(int i = 1; i <= n; i++)
	{
		cout << "Car #" << i<<endl;
		cout << "Please enter the make: ";
		getline(cin,c[i].name);     输入字符串 getline（cin，str）
		cout << "Please enter the year made: ";
		(cin >> c[i].year).get();    数字 和 字符串 混合输入记得加 .get()
	}
	for(int i = 1; i<=n; i++)
	cout << c[i].year << " " << c[i].name << endl;
	 
}

2. 5 - 8

 char 的strcmp 的 使用 
&& string 的 直接用法


#include<iostream>
#include<cstring>
using namespace std;
int main()
{
 char ch[20];
 int count;
 while(cin >> ch && strcmp(ch,"done"))
 count++;
 cout << count;
 } 
 
或者<string> 运用关系运算符 
 string str;
 while(cin >> str && str != "done") 
 */

3. 6 - 2

6 - 2
#include<iostream>
using namespace std;
int main()
{
	cout << "Please Enter one of the following choice: "<<endl;
	cout << "c) carnivore        p) pianist"<<endl;
	cout << "t) tree             g) game" <<endl;
	cout << "Please enter a c , p , t , or g: ";
	char ch;
	while(cin.get(ch).get() && (ch !='c' && ch != 'p' && ch!='t' && ch != 'g'))  注意这里要打 cin.get(ch).get()  不然cin.get 要读换行符 输出2个again 
	{
		cout << "again!";
	}
	
	switch(ch){
		case 'c': cout <<"map is a tree"; break;
		case 'p': cout <<"map is black hole";break;
		case 't': cout <<"map is nothing";break;
		case 'g': cout <<"gg";break;
	}
}

4. 6 - 6

6 - 6
#include<iostream>
using namespace std;

struct people{
	string name;
	double money;
	int flag;           //设置一个flag 来看是否过10000元
}; 

int main()
{
	int num;
	(cin >> num).get();
	people * c = new people[num];
	for(int i = 0; i < num; i++)
	{
		getline(cin,c[i].name);
	    (cin >> c[i].money).get();
	    if(c[i].money > 1000)
	    {
	    	c[i].flag = 1;
		}
		else c[i].flag = 0;
	}
	cout << "Grand patorns: ";
	for(int i = 0; i < num; i++)
	{
		if(c[i].flag == 1)
		cout << c[i].name << "   "; 
	}
	cout << endl;
	cout << "patorns: ";
	for(int i = 0; i < num; i++)
	{
		
		if(c[i].flag == 0)
		cout << c[i].name << "   ";
	}
	return 0;
}

5 6 - 7

#include<iostream>
using namespace std;

	char ch[20];

int isalpha(char ch1[])
{
	if((ch1[0] > 'a' && ch1[0] < 'z') || (ch1[0] > 'A' && ch1[0] < 'Z'))
	return 1;
	else 
	return 0;
 } 


int main()
{   int a,b,c;
    b = c = a = 0;

	cout << "Enter words (q to quit): " <<endl;
	while(cin >> ch)
	{
		if(ch[0] == 'q')
		break;
	if(isalpha(ch))
{
	 	char *p =ch;
	 	if(*p == 'a' || 'e' || 'i'|| 'o' || 'u')
	 	a++;
	 	else
	 	b++;

}
    else
    c++;
}
	 cout << a << " words are beginnig with vowels" << endl;
	 cout << b << " words are beginnig with consonants" << endl;
	 cout << c << " others";
	 return 0;
}