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review.cpp
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review.cpp
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#include <iostream>
#include <fstream>
#include <cstring>
#include <string.h>
using namespace std;
struct student
{
char no[12];
char name[20];
char date[7];
char phone[12];
};
class Solution{
public:
const char * file = "C:\\Users\\86130\\Desktop\\projects\\tasks\\cpp\\14and15contest\\output.txt";
char max[12]="00000000000";
char* strrev(char* str){
int len = strlen(str);
int i = 0;
int j = len - 1;
while (i < j){
char temp = str[i];
str[i] = str[j];
str[j] = temp;
i++;
j--;
}
return str;
}
char * plus(char* str, char num)
{
strrev(str);
int rem = 0;
int len = strlen(str);
int temp;
int i;
for (i = 0; i < len; i++)
{
temp = str[i] + num + rem - 2 * '0';
str[i] = temp % 10 + '0';
rem = temp / 10;
num = '0';
}
if (rem == 1)
str[i] = '1';
strrev(str);
return str;
}
int main()
{
char p = '1';
int ct = 0;
char name[20];
char no[12];
char date[7];
char phone[12];
char op[2];
fstream finout;
finout.open(file,ios_base::in|ios_base::binary|ios_base::out);
student st;
if (!finout.is_open())
{
cerr << "Open failed" << endl;
exit(EXIT_FAILURE);
}
finout.seekg(0);
while (finout.read((char*)&st, sizeof st))
{
if (strcmp(max,st.no)<0)
strcpy(max,st.no);
}
cin >> op;
while (op[0]!='\n')
{
finout.clear();
if (op[0] == '1')
{
finout.seekg(0);
cin >> no;
while (finout.read((char*)&st, sizeof st))
{
if (strcmp(no,st.no) == 0){
finout.seekp(0,ios_base::end);
plus(max,p);
strcpy(st.no,max);
finout.write((char* )&st,sizeof st);
break;
}
}
}
else if (op[0] == '3')
{
cin >> name >> date >> phone;
finout.seekp(0,ios_base::end);
strcpy(st.name,name);
plus(max,p);
strcpy(st.no,max);
strcpy(st.date,date);
strcpy(st.phone,phone);
finout.write((char*)&st, sizeof st);
}
else if (op[0] == '2')
{
char app[6];
cin >> app;
if (app[0] == 'b')
{
cin >> no;
finout.seekg(0);
while (finout.read((char*)&st, sizeof st))
{
if (strcmp(no,st.no) == 0){
streampos place = ct * sizeof st;
cin >> date;
strcpy(st.date,date);
finout.seekp(place);
finout.write((char* )&st,sizeof st);
break;
}
ct++;
}
}
else
{
cin >> no;
finout.seekg(0);
while (finout.read((char*)&st, sizeof st))
{
if (strcmp(no,st.no) == 0){
streampos place = ct * sizeof st;
cin >> phone;
strcpy(st.phone, phone);
finout.seekp(place);
finout.write((char* )&st, sizeof st);
break;
}
ct++;
}
}
}
ct = 0;
cin >> op;
if (cin.eof()) break;
}
finout.close();
return 0;
}
};
void print(student& st)
{
cout << st.no << " " << st.name << " " << st.date << " " << st.phone << endl;
}
int main()
{
Solution a;
a.main();
fstream fout(a.file,ios_base::in|ios_base::out|ios_base::binary);
fout.seekg(0);
student st;
while (fout.read((char *)&st, sizeof st))
{
print(st);
}
return 0;
}