C Plus Plus Program to Replace a specified Line in a Text File - cppexamples

Questions:

C Plus Plus Program to Replace a specified Line in a Text File

Explanation:

This C Plus Plus Program to Replace a specified Line in a Text File,

Code:

#include<iostream>

#include<fstream>

#include<string>

using namespace std;

void main() {

       fstream file;//creating txt file

       file.open("Reading.txt",ios::in); //opening file in reading mod Reading.txt file is located in your project foler

       int temp2 = 0;

       cout << "Data In Reading File" << endl;

       while (file) {

              string temp;

              getline(file, temp);

              temp2++;

       }

       cout << endl << endl;

       string *data = new string[temp2];

       temp2 = 0;

       file.close();

       file.open("Reading.txt", ios::in);

       cout << endl << endl << endl;

       while (file) {

              string temp;

              getline(file, temp);

              cout <<temp2+1<<"  "<< temp << endl;

              data[temp2] = temp;

              temp2++;

       }

       file.close();

       //writing data on file

       string data2;

       string data3;

       cout << "Enter Data that you want to replace == ";

       getline(cin, data2);

       cout << "Enter Data that you want to replace with == ";

       getline(cin, data3);

       file.open("Reading.txt", ios::out);

       for (int i = 0; i < temp2; i++) {

              if (data[i] == data2) {

                     data[i] = data3;

                     file << data[i] << endl;

              }

              else

                     file << data[i] << endl;

       }

       file.close();

       //printing just data

       file.open("Reading.txt", ios::in);

       temp2 = 0;

       while (file) {

              string temp;

              getline(file, temp);

              cout << temp2 + 1 << "  " << temp << endl;

              temp2++;

       }

}

Output:

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C Plus Plus Program Delete a specific Line from a Text File - cppexamples

Questions:

C Plus Plus Program Delete a specific Line from a Text File

Explanation:

This C Plus Plus Program delete a specific line from a text file.Here is source code of the C Plus Plus Program to delete a specific line from a text file. The C program is successfully compiled and run on a Visual Studio 2015. The program output is also shown below.

Code:

#include<iostream>

#include<fstream>

#include<string>

using namespace std;

void main() {

       fstream file;//creating txt file

       file.open("Reading.txt",ios::in); //opening file in reading mod Reading.txt file is located in your project foler

       int temp2 = 0;

       cout << "Data In Reading File" << endl;

       while (file) {

              string temp;

              getline(file, temp);

              temp2++;

       }

       cout << endl << endl;

       string *data = new string[temp2];

       temp2 = 0;

       file.close();

       file.open("Reading.txt", ios::in);

       cout << endl << endl << endl;

       while (file) {

              string temp;

              getline(file, temp);

              cout <<temp2+1<<"  "<< temp << endl;

              data[temp2] = temp;

              temp2++;

       }

       file.close();

       //writing data on file

       string data2;

       cout << "Enter Data that you want to delete == ";

       getline(cin, data2);

       file.open("Reading.txt", ios::out);

       for (int i = 0; i < temp2; i++) {

              if (data[i] != data2) {

                     file << data[i] << endl;

              }

       }

       file.close();

       //printing just data

       file.open("Reading.txt", ios::in);

       temp2 = 0;

       while (file) {

              string temp;

              getline(file, temp);

              cout << temp2 + 1 << "  " << temp << endl;

              temp2++;

       }

}

Output:

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How to count number of lines in text file in C++ - cppexamples

Questions:

How to count number of lines in text file in C++

Explanation:

In this program you will learn how to count number of line in a text file.


Code:

#include<iostream>

#include<fstream>

#include<string>

using namespace std;

void main() {

       fstream file;//creating txt file

       file.open("Reading.txt",ios::in); //opening file in reading mod Reading.txt file is located in your project folder

       int temp2 = 0; //counter

       cout << "Data In Reading File" << endl;

       while (file) {

              string temp;

              getline(file, temp);

              cout << temp << endl;

              temp2++;

       }

       cout << "Number of Lines == " << temp2<<endl;

}

Output:

Reading.txt

Code Output

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C Plus Plus Program to Illustrate Reading of Data from a File -- cppexamples

Questions:

C Plus Plus Program to Illustrate Reading of Data from a File

Explanation:

This C Program illustrates reading of data from a file. The program opens a file which is present. Once the file opens successfully, it uses ifstream library call to read the content.

ifstream: This data type represents the input file stream and is used to read information from files.



Code:

#include<iostream>

#include<fstream>

#include<string>

using namespace std;

void main() {

       ifstream file("Temp.txt");//creating txt file

       while (file) {

              string temp;

              getline(file, temp);

              cout << temp << endl;

       }

       file.close();

}

Output:

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Kelvin to Celsius Converter

Temperature Scale Ranges

°C: degree Celsius (centigrade), °Re: Réaumur, °F: degree Fahrenheit, K: Kelvin, °Ra: Rankine

Scale Factor		°C	°Réaumur	°F	K	°Rankine
Boiling point of water at 1 atmosphere		100	80	212	373.15	671.67
Freezing point of water at 1 atmosphere		0	0	32	273.15	491.67

Questions:

Kelvin to Celsius Converter

Code:

// Kelvin to Celsius Converter

#include<iostream>

using namespace std;

//Prototype

float Kelvin_to_Celsius(float);

void main()

{

       //Title

       cout<<"Kelvin to Celsius Converter by cppexamples.blogspot.com"<<endl<<endl;

       float Kelvin=0;

       cout<<"Enter Kelvin = ";

       cin>>Kelvin;

       cout<<"Celsius === "<<Kelvin_to_Celsius(Kelvin)<<endl;

}

//Defination

float Kelvin_to_Celsius(float Kelvin){

return Kelvin*0.8;

}

Output

Kelvin to Celsius Converter

Read More

Celsius to Réaumur Converter

Temperature Scale Ranges

°C: degree Celsius (centigrade), °Re: Réaumur, °F: degree Fahrenheit, K: Kelvin, °Ra: Rankine

Scale Factor		°C	°Réaumur	°F	K	°Rankine
Boiling point of water at 1 atmosphere		100	80	212	373.15	671.67
Freezing point of water at 1 atmosphere		0	0	32	273.15	491.67

Questions:

Celsius to Réaumur Converter

Code:

// Celsius to Réaumur Converter

#include<iostream>

using namespace std;

//Prototype

float Celsius_to_Réaumur(float);

void main()

{

       //Title

       cout<<"Celsius to Réaumur Converter by cppexamples.blogspot.com"<<endl<<endl;

       float Celsius=0;

       cout<<"Enter Celsius = ";

       cin>>Celsius;

       cout<<"Réaumur === "<<Celsius_to_Réaumur(Celsius)<<endl;

}

//Defination

float Celsius_to_Réaumur(float Celsius){

return Celsius*0.8;

}

Output

Celsius to Réaumur Converter

Read More

Celsius to Rankine Converter

Questions:

Celsius to Rankine Converter

Code:

// Celsius to Rankine Converter

#include<iostream>

using namespace std;

//Prototype

float Celsius_to_Rankine(float);

void main()

{

       //Title

       cout<<"Celsius to Rankine Converter by cppexamples.blogspot.com"<<endl<<endl;

       float Celsius=0;

       cout<<"Enter Celsius = ";

       cin>>Celsius;

       cout<<"Rankine === "<<Celsius_to_Rankine(Celsius)<<endl;

}

//Defination

float Celsius_to_Rankine(float Celsius){

return Celsius*1.8 + 32 + 459.67;

}

Output

Celsius to Rankine Converter

Read More

Celsius to Kelvin Converter

Questions:

Celsius to Kelvin Converter

Code:

// Celsius to Kelvin Converter by cppexamples.blogspot.com

#include<iostream>

using namespace std;

//Prototype

float Celsius_to_Kelvin(float);

void main()

{

       //Title

       cout<<"Celsius to Kelvin Converter by cppexamples.blogspot.com"<<endl<<endl;

       float Celsius=0;

       cout<<"Enter Celsius = ";

       cin>>Celsius;

       cout<<"Kelvin === "<<Celsius_to_Kelvin(Celsius)<<endl;

}

//Defination

float Celsius_to_Kelvin(float Celsius){

return Celsius+273.5;

}

Output

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