c++ primer 练习 3.1、3.2、3.3、3.4、3.5

#include<iostream>
using std::cout;
using std::endl;
int main()
{
int sum = 0;
for(int val = 50; val <= 100; ++val)
sum += val;
cout << sum << endl;
return 0;
}

#include<iostream>
using std::cout;
using std::endl;
int main()
{
int sum = 0;
for(int val = 10; val >= 0; --val)
cout << val << endl;
return 0;
}

#include<iostream>
using std::cout;
using std::endl;
using std::cin;
int main()
{
int a, b;
cin >> a >> b;
for(int val = a; val <= b; ++val)
cout << val << endl;
return 0;
}

#include<iostream>
#include<string>
using std::cout;
using std::cin;
using std::endl;
using std::string;
struct Sales_data{
string bookNo;
unsigned units_sold = 0;
double price = 0.0;
double revenue = 0.0;
};
int main()
{
Sales_data data;
// std::cin >> data;
cin >> data.bookNo >> data.units_sold >> data.price;
// std::cout << data;
cout << data.bookNo << " " << data.units_sold << " " << data.price << endl;
return 0;
}

#include<iostream>
#include<string>
using std::cout;
using std::cin;
using std::endl;
using std::string;
struct Sales_data{
string bookNo;
unsigned units_sold = 0;
double price = 0.0;
double revenue = 0.0;
};
int main()
{
Sales_data data1, data2;
// std::cin >> data1 >> data2;
cin >> data1.bookNo >> data1.units_sold >> data1.price;
cin >> data2.bookNo >> data2.units_sold >> data2.price;
// std::cout << data1 + data2;
cout << data1.bookNo << " " << data1.units_sold + data2.units_sold << " " << data1.price << endl;
return 0;
}

#include<iostream>
#include<string>
using std::cout;
using std::cin;
using std::endl;
using std::string;
struct Sales_data{
string bookNo;
unsigned units_sold = 0;
double price = 0.0;
double revenue = 0.0;
};
int main()
{
Sales_data data, sum_data;
while(cin >> data.bookNo >> data.units_sold >> data.price)
sum_data.units_sold += data.units_sold;
cout << data.bookNo << " " << sum_data.units_sold << " " << data.price << endl;
return 0;
}

#include<iostream>
#include<string>
using std::string;
using std::cout;
using std::cin;
using std::endl;
struct Sales_data{
string bookNo;
unsigned units_sold = 0;
double price = 0.0;
double revenue = 0.0;
};
int main()
{
int num = 0;
string last_bookNo;
Sales_data temp_data;
// 读取第一个
// std::cin >> temp_data;
cin >> temp_data.bookNo >> temp_data.units_sold >> temp_data.price;
last_bookNo = temp_data.bookNo;
num = 1;
// while(cin >> temp_data){
while(cin >> temp_data.bookNo >> temp_data.units_sold >> temp_data.price){
if(temp_data.bookNo == last_bookNo){
++num;
}
else{
cout << last_bookNo << " " << num;
last_bookNo = temp_data.bookNo;
num = 1;
}
}
cout << last_bookNo << " " << num;
return 0;
}

#include<iostream>
#include<string>
using std::cerr;
using std::string;
using std::cin;
using std::cout;
using std::endl;
struct Sales_data{
string bookNo;
unsigned units_sold = 0;
double price = 0.0;
double revenue = 0.0;
};
int main()
{
Sales_data total;
if(cin >> total.bookNo >> total.units_sold >> total.price){
Sales_data trans;
// while(cin >> total)
while(cin >> trans.bookNo >> trans.units_sold >> trans.price){
if(total.bookNo == trans.bookNo){
total.units_sold += trans.units_sold;
}else{
// std::cout << total << std::endl;
cout << total.bookNo << " " << total.units_sold << " " << total.price << endl;
// total = trans;
total = trans;
}
}
cout << total.bookNo << " " << total.units_sold << " " << total.price << endl;
}else{
cerr << "No data?" << endl;
return -1;
}
return 0;
}

#include<iostream>
using std::cin;
using std::cout;
using std::endl;
#include<string>
using std::string;

int main()
{
string line;
while(getline(cin , line))
cout << line << endl;
return 0;
}

#include<iostream>
using std::cin;
using std::cout;
using std::endl;
#include<string>
using std::string;

int main()
{
string word;
while(cin >> word)
cout << word << endl;
return 0;
}

#include<iostream>
using std::cout;
using std::cin;
using std::endl;
#include<string>
using std::string;
int main()
{
string s1, s2;
cin >> s1 >> s2;
if(s1 == s2)
cout << "Equal" << endl;
else if(s1 > s2)
cout << s1 << endl;
else
cout << s2 << endl;
return 0;
}

#include<iostream>
using std::cout;
using std::cin;
using std::endl;
#include<string>
using std::string;
int main()
{
string s1, s2;
cin >> s1 >> s2;
if(s1.size() == s2.size())
cout << "Equal" << endl;
else if(s1.size() > s2.size())
cout << s1 << endl;
else
cout << s2 << endl;
return 0;
}

#include<iostream>
using std::cout;
using std::cin;
using std::endl;
#include<string>
using std::string;
int main()
{
string sum_string;
string temp_string;
while(cin >> temp_string)
sum_string += temp_string;
cout << sum_string << endl;
return 0;
}

#include<iostream>
using std::cout;
using std::cin;
using std::endl;
#include<string>
using std::string;
int main()
{
string sum_string;
string temp_string;
while(cin >> temp_string)
sum_string += temp_string + " ";
cout << sum_string << endl;
return 0;
}