How to Search for a word in c++

I suggest searching for words in a text file using the C ++ programming language, but before looking at code and video, you all need to understand its key points before getting started.Coding for these words

C++ is a powerful general-purpose programming language. It can be used to develop operating systems, browsers, games, and so on. C++ supports different ways of programming like procedural, object-oriented, functional, and so on. This makes C++ powerful as well as flexible.

iostream

Declares objects that control reading from and writing to the standard streams. This include is often the only header you need to do input and output from a C++ program.

Syntax

#include<iostream>

Name	Descrotion
Cin	Specifies the Cin global stream.
Cout	Specifies the Cout global stream.

Cin

Specifies the Cin global stream.

Extern Istream cin

Return

An istream Object.

Cout

Specifies the Cout global stream.

Extern Ostream Cout

Return

An ostream Object.

fstream

This data type represents the file stream generally, and has the capabilities of both ofstream and ifstream which means it can create files, write information to files, and read information from files

Writing to a File

While doing C++ programming, you write information to a file from your program using the stream insertion operator (<<) just as you use that operator to output information to the screen. The only difference is that you use an ofstream or fstream object instead of the cout object.

Reading from a File

You read information from a file into your program using the stream extraction operator (>>) just as you use that operator to input information from the keyboard. The only difference is that you use an ifstream or fstream object instead of the cinobject.

Read and Write Example

Following is the C++ program, which opens a file in reading and writing mode. After writing information entered by the user to a file named Student.txt, the program reads information from the file and outputs it onto the screen

Example

How to Search for a Word in C++ Programming

How to Search for a word in a text file and if found print out the entire line.

ID	First Name	Last Name	Age	Phone Number
1	Pov	Dara	32	4444
2	Heng	Nimol	20	5555

Code

#include <iostream<
#include <fstream<
using namespace std;
class student{
int id,age,phone;
char first[20],last[20];
public: void writing()
{
cout<<"Please input Number ID";cin<<id;
cout<<"Please input first name";cin<<first;
cout<<"Please input last name";cin<<last;
cout<<"Please input age";cin<<age;
cout<<"Please input Phone Number";cin<<phone;
ofstream os;
os.open("student.txt",ios::app|ios::out);
os<<id<<"\t"<<first<<"\t"<<last<<"\t"<<age<<"\t"<<phone<<"\t"<<endl;
os.close();
}
void deletedata()
{
string line,id;
cout<<"Please input id do you to delete";
cin<<id;
ifstream writedata;
ofstream readdata;
writedata.open("student.txt");
readdata.open("temp.txt");
while(getline(writedata,line))
{
if(line!=id)
{
readdata <<line <<endl;
cout<<"Delete Succcess" <<id;
writedata.close();
readdata.close();
remove("student.txt");
rename("temp.txt","student.txt");
}
}
}
void searchfile(){
ifstream filesearch;
filesearch.open("student.txt");
string line, search;
cout << "Please input Phone Number do you want to search ";
cin >> search;
for (unsigned int i = 1; getline(filesearch, line); i++)
{
if (line.find(search) != string::npos)
{
cout << "found: " << search << " line: " << i<<endl;
}
else
{
cout << "Not found Data" << i << endl;
}}}};
int main()
{
student obj;
int i;
cout<<"Please Choose option is below"<<endl;
cout<<"1: Write Data"<<endl;
cout<<"2: Detele Data"<<endl;
cout<<"3: Search Data"<<endl;
cin>>i;
switch(i){
case 1: {
obj.writing();
break;
}
case 2:
{
obj.deletedata();
break;
}
case 3:
{
obj.searchfile();
break;
}}}