Question

Write a C++ program that will read data from a file. Each line of this input file contains different
mathematical expressions. Calculate the expressions and save the results into another file. Ask from​

Answer 1

Answer:

Here's smthin in attachment fr u that ll help uh

.................

To wri8:..

//C++ program to write and read text in/from file.

#include <iostream>

#include <fstream>

using namespace std;

int main()

{

fstream file; //object of fstream class

//opening file "sample.txt" in out(write) mode

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

if(!file)

{

cout<<"Error in creating file!!!"<<endl;

return 0;

}

cout<<"File created successfully."<<endl;

//write text into file

file<<"ABCD.";

//closing the file

file.close();

//again open file in read mode

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

if(!file)

{

cout<<"Error in opening file!!!"<<endl;

return 0;

}

//read untill end of file is not found.

char ch; //to read single character

cout<<"File content: ";

while(!file.eof())

{

file>>ch; //read single character from file

cout<<ch;

}

file.close(); //close file

return 0;

}