6.33
#include "stdafx.h"
#include "iostream"
#include "stddef.h"
#include "string"
#include<vector>
using namespace std;
//2018_7_29,递归主要思想:返回的还是原先的vector,但是迭代器加一。
vector<int> output(const vector<int> &s1, vector<int>::iterator iter);
int main()
{
vector<int> v1;
for (int i = 0;i != 5;++i)
v1.push_back(i);
auto beg = v1.begin();
output(v1,beg);
return 0;
}
vector<int> output(const vector<int> &s1,vector<int>::iterator iter)
{
if (iter != s1.end())
{
cout << *iter << endl;
return output(s1,iter + 1);
}
return {};
}
6.34
#include "stdafx.h"
#include "iostream"
#include "stddef.h"
#include "string"
#include<vector>
using namespace std;
//2018_7_29
int factorial(int val);
int main()
{
cout<<factorial(5)<<endl;
system("pause");
return 0;
}
int factorial(int val)
{
if (val!=0)
return factorial(val - 1)*val;
return 1;
}
6.42
#include "stdafx.h"
#include "iostream"
#include "stddef.h"
#include "string"
#include<vector>
using namespace std;
//2018年8月11日,练习6.42
string make_plural(size_t ctr, const string &word, char end = 's')
{
return (ctr > 1) ? word + end : word;
}
int main() {
cout << make_plural(2, "failure") << endl;
system("pause");
return 0;
}
6.56
#include "stdafx.h"
#include "iostream"
#include "stddef.h"
#include "string"
#include<vector>
using namespace std;
//2018年8月11日,练习6.42
int add(int a, int b)
{
return a + b;
}
int minuss(int a, int b)
{
return a - b;
}
int multiply(int a, int b)
{
return a * b;
}
int divide(int a, int b)
{
return a / b;
}
int main() {
int func(int, int);
int a, b;
using funcp = int(*)(int, int);
vector<funcp> vec;
vec = {add,minuss,divide,multiply};
for (auto &c : vec)
{
cout << c << endl;
}
system("pause");
return 0;
}