1.读取键盘输入
#include "stdafx.h"
#include<iostream>
#include<string>
using namespace std;
int main()
{
char ch=0;
cout<<"Please enter:";
while((ch=cin.get())!='@')
{
if(isdigit(ch))
{
continue;
}
else if (islower(ch))
{
cout<<(char)toupper(ch);
}
else if (isupper(ch))
{
cout << (char)tolower(ch)<<endl;;
}
}
cout << "Ending" << endl;
return 0;
}
2.存十个数值
#include "stdafx.h"
#include<iostream>
#include<string>
#include<array>
using namespace std;
const unsigned int SIZE=10;
int main()
{
array<double,SIZE> donation;
int enter=0;
double total_value=0.0;
double avg=0.0;
int over_avg=0;
cout<<"Please enter ten doulbe value(Non-numeric to exit):";
while(enter<10&&(cin>>donation[enter]))
{
total_value+=donation[enter];
enter++;
}
avg=total_value/enter;
for(int i=0;i<enter;i++)
{
if(donation[i]>avg)
{
over_avg++;
}
}
cout<<"The average value is "<<avg<<",and there are "<<over_avg
<<" double value more than average !"<<endl;
return 0;
}
3.菜单驱动程序
#include "stdafx.h"
#include<iostream>
#include<string>
using namespace std;
int main()
{
char ch=0;
cout<<"Please enter one of the following choices:\n"
"c) carnivore p)pianist \n"
"t) tree g)game\n";
while(cin>>ch)
{
switch(ch)
{
case 'c':
cout<<"carnivore"<<endl;
break;
case 'p':
cout << "pianist" << endl;
break;
case 't':
cout << "A map is a tree" << endl;
break;
case 'g':
cout << "game" << endl;
break;
default:
cout << "Please enter a c, p, t or g:";
break;
}
}
return 0;
}
4.BOP
#include "stdafx.h"
#include<iostream>
#include<string>
#include<array>
using namespace std;
const int strsize = 64;
struct bop{
char fullname[strsize];
char title[strsize];
char bopname[strsize];
int preference;
};
int main()
{
char choice;
bop bopArray[5]= {
{"000","AAA","BBB",0},
{"CCC","DDD","EEE",0},
{"FFF","GGG","HHH",1},
{"III","JJJ","KKK",1},
{"LLL","MMM","NNN",2},
};
cout<<"Benevolent Order of Programmers Report\n"
"a.display by name b.display by title\n"
"c.display by bopname d.display by preference\n"
"q.quit\n";
cout<<"Enter your choice:";
while(cin>>choice)
{
if(choice=='q')
{
break;
}
switch(choice)
{
case 'a':
for(int i=0;i<5;i++)
cout<<bopArray[i].fullname<<endl;
break;
case 'b':
for(int i=0;i<5;i++)
cout<<bopArray[i].title<<endl;
break;
case 'c':
for(int i=0;i<5;i++)
cout<<bopArray[i].bopname<<endl;
break;
case 'd':
for(int i=0;i<5;i++)
switch(bopArray[i].preference)
{
case 0: cout<<bopArray[i].fullname<<endl; break;
case 1: cout<<bopArray[i].title<<endl; break;
case 2: cout<<bopArray[i].bopname<<endl; break;
}
break;
default:
break;
}
cout<<"Next choice:";
}
cout<<"Bye!"<<endl;
return 0;
}
5.征税
#include "stdafx.h"
#include<iostream>
#include<string>
using namespace std;
int main()
{
cout<<"Enter your income: ";
int income;
double tax = 0;
while( cin>>income )
{
if(income >= 0 && income <= 5000) tax = 0.00;
else if(income >= 5001 && income <= 15000)
tax = (income - 5000) * 0.10;
else if(income >= 15001 && income <= 35000)
tax = (income - 15000) * 0.15 + 10000 * 0.10;
else if(income >= 35001)
tax = 10000 * 0.10 + 20000 * 0.15 + (income - 35000) * 0.20;
else
break;
cout<<"Your tax is "<<tax<<endl;
cout<<"Enter your income: ";
}
return 0;
}
6.捐助
#include "stdafx.h"
#include<iostream>
#include<string>
using namespace std;
struct patron{
string name;
double money;
};
int main()
{
int patrons_num;
int grand_num = 0;
int ordinary_num = 0;
cout<<"Enter the number of patrons: ";
cin>>patrons_num;
patron *patrons = new patron [patrons_num];
for(int i=0;i<patrons_num;i++)
{
cout<<"Please enter the name of the patron"<<"["<<i+1<<"] : ";
getline(cin,patrons[i].name);
cout<<"Please enter the money of the patron"<<"["<<i+1<<"] : ";
cin>>patrons[i].money;
}
cout<<"Grand Patrons: "<<endl;
for(int i=0;i<patrons_num;i++)
{
if(patrons[i].money > 10000)
{
grand_num++;
cout<<"name: \t"<<patrons[i].name<<"\tmoney: "<<patrons[i].money<<endl;
}
}
if(grand_num == 0)
cout<<"none"<<endl;
cout<<"Patrons: "<<endl;
for(int i=0;i<patrons_num;i++)
{
if(patrons[i].money <= 10000)
{
ordinary_num++;
cout<<"name: \t"<<patrons[i].name<<"\tmoney: "<<patrons[i].money<<endl;
}
}
if(ordinary_num == 0) cout<<"none"<<endl;
return 0;
}
7.读取单词
#include "stdafx.h"
#include<iostream>
#include<string>
using namespace std;
int main()
{
char word[20];
int vowels = 0;
int consonants = 0;
int others = 0;
cout<<"Enter words( q to quit ): "<<endl;
while( cin>>word )
{
if( word[0] == 'q' && strlen(word) == 1)
break;
if( isalpha(word[0]) )
{
switch(word[0])
{
case 'a': case 'A': case 'e': case 'E': case 'i':
case 'I': case 'o': case 'O': case 'u': case 'U':
vowels++; break;
default:
consonants++;
}
}
else
others++;
}
cout<<vowels<<" words beginning with vowels."<<endl
<<consonants<<" words beginning with consonants."<<endl
<<others<<" others."<<endl;
return 0;
}
8.读文件字符
#include "stdafx.h"
#include<iostream>
#include<string>
#include<fstream>
using namespace std;
int main()
{
string FileName;
ifstream inFile;
unsigned int num = 0;
char ch = 0;
cout << "Enter the file name:";
getline(cin, FileName);
inFile.open(FileName.c_str());
while ((ch = inFile.get()) != EOF)
{
num++;
}
cout << "There are " << num << " characters in " << FileName << " file." << endl;
return 0;
}
9.读文件信息
#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
struct patron
{
string name;
double money;
};
int main()
{
fstream infile;
infile.open("test.txt", ios::in);
if( !infile.is_open() )
{
cout<<"Open the file error!!!"<<endl;
exit(EXIT_FAILURE);
}
int patrons_number;
(infile>>patrons_number).get();
patron *patrons = new patron [patrons_number];
int i=0;
while( infile.good() )
{
getline(infile, patrons[i].name);
(infile>>patrons[i].money).get();
i++;
}
unsigned int grand_number = 0;
unsigned int ordinary_number = 0;
cout<<"Grand Patrons: "<<endl;
for(int i=0;i<patrons_number;i++)
{
if(patrons[i].money > 10000)
{
grand_number++;
cout<<"name: \t"<<patrons[i].name<<"\tmoney: "<<patrons[i].money<<endl;
}
}
if(grand_number == 0) cout<<"none"<<endl;
cout<<"Patrons: "<<endl;
for(int i=0;i<patrons_number;i++)
{
if(patrons[i].money <= 10000)
{
ordinary_number++;
cout<<"name: \t"<<patrons[i].name<<"\tmoney: "<<patrons[i].money<<endl;
}
}
if(ordinary_number == 0) cout<<"none"<<endl;
return 0;
}