C++ File Handling write() Function
In file handling, write() function is used to write data into the file. The write() uses ofstream or fstreamlibrary to write into file.
Syntax
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file-stream-class file-stream-object; file-stream-object.write((char *)&var , sizeof (var)); |
The write() takes two arguments. The first argument is address of variable var and second argument is size of variable var in bytes.
Example
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ofstream outfile; outfile .write ((char*)&emp,sizeof(emp)); |
C++ File Handling write() Function Example
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#include <iostream> #include <fstream> using namespace std; class employee { private: char name[30]; float salary; public: void getData(void) { cout<<"Enter name:"; cin.getline(name,sizeof(name)); cout<<"Enter salary:"; cin>>salary; } }; int main() { employee emp; ofstream file; file.open("employee.txt",ios::out);//open file in write mode if(!file) { cout<<"File not found"<<endl; return 0; } cout<<"File created successfully."<<endl; emp.getData(); file.write((char*)&emp,sizeof(emp)); //write into file file.close(); //close the file cout<<"File save and closed succesfully."<<endl; return 0; } |
Output:
