Number of class templates
Description
Define a class template Data, which is used to wrap the basic data types int and double in C++. it includes:
The data member value is the value wrapped by the object.
No-argument constructor (initialized value is 0) and parameterized constructor.
Overloaded operators: >, <, +, and <<. Among them, "+" returns a sum without changing the values of the two operands.
The member function setValue is used to set the value of value.
Define another class template GetResult, which has only 3 static member functions (the following "T" is a type parameter):
static Data getSum(Data *arr, int num): Find the sum of num Data objects stored in arr, and return a Data object composed of this sum.
static Data getMax(Data *arr, int num): Find the maximum value of num Data objects stored in arr, and return the object corresponding to this maximum value.
static Data getMin(Data *arr, int num): Find the minimum value of num Data objects stored in arr, and return the object corresponding to this minimum value.
Input
Enter multiple lines.
In the first line, M>0 means there are M test cases.
There are only M lines, each line starts with a letter i or d, and the second is a positive integer N>0. If the first letter is i, it means that the row contains N int data; if the first letter is d, it means that there are N double data in this row.
Output
Except for the first 6 lines of output, the number of lines of other output is equal to M. Each row outputs 3 data: the maximum, minimum, and sum of the corresponding test case. Real numbers output fixed-point decimals, and only output 2 decimals.
Sample Input
3
i 3 1 2 3
d 3 1.1 2.2 3.3
i 1 10
Sample Output
a + b = 30
max(a, b) = 20
min(a, b) = 10
c + d = -0.96
max(c, d) = 3.14
min(c, d) = -4.10
3 1 6
3.30 1.10 6.60
10 10 10
Title given code
int main()
{
Data<int> iData[1001];
Data<double> dData[1001];
int cases, num;
char ch;
int u;
double v;
Data<int> a(10), b(20);
Data<double> c(3.14), d(-4.1);
cout<<"a + b = "<<(a + b)<<endl;
cout<<"max(a, b) = "<<(a > b ? a : b)<<endl;
cout<<"min(a, b) = "<<(a < b ? a : b)<<endl;
cout<<"c + d = "<<(c + d)<<endl;
cout<<"max(c, d) = "<<(c > d ? c : d)<<endl;
cout<<"min(c, d) = "<<(c < d ? c : d)<<endl;
cin>>cases;
for (int i = 0; i < cases; i++)
{
cin>>ch;
cin>>num;
for (int j = 0; j < num; j++)
{
if (ch == 'i')
{
cin>>u;
iData[j].setValue(u);
}
else if (ch == 'd')
{
cin>>v;
dData[j].setValue(v);
}
}
if (ch == 'i')
{
cout<<GetResult<int>::getMax(iData, num);
cout<<" "<<GetResult<int>::getMin(iData, num);
cout<<" "<<GetResult<int>::getSum(iData, num)<<endl;
}
else if (ch == 'd')
{
cout<<GetResult<double>::getMax(dData, num);
cout<<" "<<GetResult<double>::getMin(dData, num);
cout<<" "<<GetResult<double>::getSum(dData, num)<<endl;
}
}
return 0;
}
code：
#include<iostream>
#include<iomanip>
using namespace std;
template<class T>
class Data{
T value;
public:
Data(){
value=0;
}
Data(T t){
value=t;
}
T operator+(Data<T> &t2){
return t2.value+value;
}
friend bool operator >(Data<T> &d1,Data<T> &d2){
return d1.value>d2.value;
}
friend bool operator <(Data<T> &d1,Data<T> &d2){
return d1.value<d2.value;
}
friend ostream& operator <<(ostream &os,const Data<T> &D){
os<<fixed<<setprecision(2)<<D.value;
//注意，fixed和setprecision在<iomanip>头文件里面
return os;
}
T getValue(){
return value;
}
void setValue(T t){
value=t;
}
};
template<class T>
class GetResult{
public:
static Data<T> getSum(Data<T> *arr, int num){
T t=0;
for(int i=0;i<num;i++){
t+=arr[i].getValue();
}
return Data<T>(t);
}
static Data<T> getMax(Data<T> *arr,int num){
T t=arr[0].getValue();
for(int i=1;i<num;i++){
if(arr[i].getValue()>t)t=arr[i].getValue();
}
return Data<T>(t);
}
static Data<T> getMin(Data<T> *arr,int num){
T t=arr[0].getValue();
for(int i=1;i<num;i++){
if(arr[i].getValue()<t)t=arr[i].getValue();
}
return Data<T>(t);
}
};
int main()
{
Data<int> iData[1001];
Data<double> dData[1001];
int cases, num;
char ch;
int u;
double v;
Data<int> a(10), b(20);
Data<double> c(3.14), d(-4.1);
cout<<"a + b = "<<(a + b)<<endl;
cout<<"max(a, b) = "<<(a > b ? a : b)<<endl;
cout<<"min(a, b) = "<<(a < b ? a : b)<<endl;
cout<<"c + d = "<<(c + d)<<endl;
cout<<"max(c, d) = "<<(c > d ? c : d)<<endl;
cout<<"min(c, d) = "<<(c < d ? c : d)<<endl;
cin>>cases;
for (int i = 0; i < cases; i++)
{
cin>>ch;
cin>>num;
for (int j = 0; j < num; j++)
{
if (ch == 'i')
{
cin>>u;
iData[j].setValue(u);
}
else if (ch == 'd')
{
cin>>v;
dData[j].setValue(v);
}
}
if (ch == 'i')
{
cout<<GetResult<int>::getMax(iData, num);
cout<<" "<<GetResult<int>::getMin(iData, num);
cout<<" "<<GetResult<int>::getSum(iData, num)<<endl;
}
else if (ch == 'd')
{
cout<<GetResult<double>::getMax(dData, num);
cout<<" "<<GetResult<double>::getMin(dData, num);
cout<<" "<<GetResult<double>::getSum(dData, num)<<endl;
}
}
return 0;
}