题目出自《C++ Primer Plus》第5章
假设要销售《C++ For Fools》一书。请编写一个程序，输入全年中每个月的销售量（图书数量，而不是销售额)。程序通过循环，使用初始化为月份字符串的char*数组或string对象数组）逐月进行提示，并将输入的数据储存在一个int数组中。然后，程序计算数组中各元素的总数，并报告这一年的销售情况（我自定义了结构体数组一并完成第六题）。
#include <iostream>
#include <cstdio>
const int this_year = 2017;
const int years = 3;
const int per_year = 12;
struct record
{
int years;
int months;
long sales;
};
int main()
{
using namespace std;
record (*date)[per_year] = new record [years][per_year];
for (int i = 0;i < years;++i)
for (int j = 0;j < per_year; ++j)
{
date[i][j].years=this_year+i;
date[i][j].months=j+1;
cout << "Please input sales for "
<< date[i][j].years
<< " year "
<< date[i][j].months
<< " month:\n";
cin >> date[i][j].sales;
}
long long * sales_per_year = new long long [years];
for (int i = 0;i < years; ++i)
{
for (int j = 0;j < per_year; ++j)
sales_per_year[i] += date[i][j].sales;
cout << this_year + i
<< " year had been sale "
<< sales_per_year[i]
<< " books." << endl;
}
return 0;
}
编写一个程序，它使用一个char数组和循环来每次读取一个单词，直到用户输入done为止。随后，该程序指出用户输入了多少个单词（不包括done在内）。下面是该程序的运行情况：
Enter words (to sto p , type the word done) ：</span> anteater birthday category dumpster envy finagle geometry done for sure You entered a total of 7 words.
您应在程序中包含头文件cstring,并使用函数StrCmp()来进行比较测试
#include <iostream>
#include <cstring>
#include <stdio.h>
using namespace std;
int main()
{
char * ch = new char;
char * word = new char [100];
char * string = new char [100];
int *pcw = new int ;
int *pcc = new int ;
*pcc=*pcw=0;
//确认前面的一个字符不为空
bool empty=true;
while ( strcmp(word,"done") )
{
*ch=getchar();
if ( *ch == EOF || *ch == ' ' || *ch == '\n' )
{
if ( empty )
{
continue;
}
strcpy(word,string);
string[0]='\0';
*pcc=0;
if ( word[0] != ' ' || word[0] != '\n' || word[0] != EOF )
++*pcw;
empty=true;
continue;
}
string[*pcc]=*ch;
empty=false;
string[(*pcc)+1]='\0';
(*pcc)+=1;
}
cout << "You entered a total of "
<< (*pcw)-1
<< " words."
<< endl;
return 0;
}
题目出自《C++ Primer Plus》第6章
编写一个程序，它毎次读取一个单词，直到用户只输入q。然后, 该程序指出有多少个单词以元音打头，有多少个单词以辅咅打头，还有多少个单词不属于这两类。为此，力法之一睡是，使用isalpha()来区分以字母和其他字符打头的单词,然后对于通过isalpha()测试的单词，使用if或switch语句来确定哪些以元音打头。该程序的运行情况如下：
Enter words (q to quit ) : The 12 awesome oxen ambled quietly across 15 meters of lawn. q 5 words be ginning with vowels 4 words be ginning with consonants 2 other
*需要判断每个字符的前面一个字符和后面一个字符
#include <iostream>
#include <cctype>
#include <cstdio>
using namespace std;
int main()
{
cout << "Enter words (q to quit):" << endl;
char ch;
bool empty = true;
int vowels,consonants,others;
others=vowels=consonants=0;
while ( ch = cin.get() )
{
cin.clear();
if (empty)
{
if ( isalpha(ch) )
{
if ( ch == 'q' )
{
char temp;
temp=cin.get();
if (temp == '\n' || temp == ' ' || temp == EOF)
{
empty = true;
break;
}
else
{
++consonants;
empty = false;
}
}
else if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch =='u')
{
++vowels;
empty = false;
}
else
{
++consonants;
empty = false;
}
}
else
{
++others;
char temp;
if ((temp = cin.get()) != '\n' || temp != ' ' || temp != EOF)
{
empty = false;
}
else
{
empty = true;
}
}
}
else if (ch == '\n' || ch == ' ' || ch == EOF)
empty = true;
else
{
empty = false;
continue;
}
}
cout << vowels << " words beginning with vowels" << endl;
cout << consonants << " words begining with consonants" << endl;
cout << others << " others" << endl;
return 0;
}
题目出自《C++ Primer Plus》第8章
函数重载(多态)，函数模板
#include <iostream>
template <typename T> void ShowArray(T arr[],int n);
template <typename T> void ShowArray(T * arr[],int n);
int SumArray(int * ,int n);
double SumArray(double * *,int n);
struct debts
{
char name[50];
double amount;
};
int main()
{
using namespace std;
int things[6] = { 13,31,103,301,310,130 };
struct debts mr_E[3] =
{
{ "Ima Wolfa", 2400.0 },
{ "Ura Foxe", 1300.0 },
{ "Iby Stout", 1800.0 }
};
double * pd[3];
for (int i = 0; i < 3; i++)
pd[i] = &mr_E[i].amount;
cout << "Listing Mr. E's counts of things:\n";
ShowArray(things,6);
cout << "Listing Mr. E's debts:\n";
ShowArray(pd,3);
cout << SumArray(things,6) << endl;
cout << SumArray(pd,3) << endl;
return 0;
}
template <typename T> void ShowArray(T arr [], int n)
{
using namespace std;
cout << "template A\n";
for(int i = 0;i < n;i++)
cout << arr[i] << ' ';
cout << endl;
return ;
}
template <typename T> void ShowArray(T * arr [] ,int n)
{
using namespace std;
cout << "template B\n";
for(int i = 0;i < n;i++)
cout << *arr[i] << ' ';
cout << endl;
return ;
}
int SumArray(int * arr, int n)
{
int result = 0;
for (int i = 0;i < n;i++)
result += arr[i];
return result;
}
double SumArray(double * * arr,int n)
{
double result = 0;
for(int i = 0;i < n;i++)
result += *arr[i];
return result;
}
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