#include <iostream>#include <fstream>#include <string>#include <vector>using namespace std;void main(int argc, char* argv[]){	ifstream in("C:\\Users\\Administrator\\Desktop\\C++.txt",ifstream::out);	ofstream out("C:\\Users\\Administrator\\Desktop\\CC.txt",ifstream::app);	if(!in)	{		cout<<"Cannot open input file!"<<endl;	}	string str;	while(getline(in,str))	{		out.write(str.c_str(),str.size());		out.write("\n",1);	}}

#include <iostream>using namespace std;int atoi(char* ch);char* itoa(int n,char* ch);char* reverse(char* ch);void main(int argc, char* argv[]){	char* ch = "123579";	int a = atoi(ch);	cout<<a<<endl;	int n = 752456;	char cc[10];	char* c = itoa(n,cc);	cout<<c<<endl;}int atoi(char* ch){	int i = 0;	int num = 0;	while (ch[i] != ‘\0‘)	{		num = num * 10 + ch[i]- ‘0‘;		i++;	}	return num;}char* itoa(int n,char* ch){	int i = 0;	while(n)	{		ch[i++] = n % 10 + ‘0‘;		n = n / 10;	}	ch[i]=‘\0‘;	return reverse(ch);}char* reverse(char* ch){	int size = 0;	while(ch[size]!=‘\0‘)	{		size++;	}	char temp;	for(int i = 0, j = size - 1; i < j; i++,j--)	{		temp = ch[i];		ch[i] = ch[j];		ch[j] = temp;	}	return ch;}

#include <iostream>#include <vector>#include <algorithm>using namespace std;void main(int argc, char* argv[]){	int num;	vector<int> nums;	while(cin>>num)	{		if(num==-1) break;		nums.push_back(num);	}		int number = 5;	int times = 0;	vector<int>::const_iterator result = find(nums.cbegin(),nums.cend(),number);	while(result != nums.cend())	{		times++;		result++;		result = find(result,nums.cend(),number);	}	cout<<"Total Times of 5 is: "<<times<<endl;}