How read a string from a file in C++?

How read a string from a file in C++?

Call open() method to open a file “tpoint. txt” to perform read operation using object newfile. If file is open then Declare a string “tp”. Read all data of file object newfile using getline() method and put it into the string tp.

How do I find a specific word in a string C++?

Let’s see simple example of finding a single character.

  1. #include
  2. using namespace std;
  3. int main()
  4. {
  5. string str = “javatpoint”;
  6. cout << “String contains :” << str;
  7. cout<< “position of p is :” << str.find(‘p’);
  8. return 0;

What is string NPOS?

What is string::npos: It is a constant static member value with the highest possible value for an element of type size_t. It actually means until the end of the string. It is used as the value for a length parameter in the string’s member functions. As a return value, it is usually used to indicate no matches.

How do I read from a file in C++?

You can read information from files into your C++ program. This is possible using stream extraction operator (>>). You use the operator in the same way you use it to read user input from the keyboard. However, instead of using the cin object, you use the ifstream/ fstream object.

How do you search for a string in a file?

In the if statement we use the strstr() function to search for our string in the content we fetched from the file. If we found a match we display line-number, line and we increase find_result with one. The while loop will continue until we reach the end of the file.

How do I search for a specific file in a directory?

To search every file in the current directory and all subdirectories that contained the word Windows, regardless of the letter case, type: findstr /s /i Windows *.*

How do I search a string in a loop in Python?

1 Read (parts of) the file into memory, then use standard string function strstr()to search the string (in a loop). – pmg

How to search a string using fgets and printf?

printf (” Enter the string you want to search “); printf (” The read string is =%s “,string1 ); while ( fgets (string2,20,Input) != ‘\\0’) printf (” string successfully searched : string2 = %s”,string1); I got output Like below….