Eroare de compilare: user.cpp:5:1: error: ‘ifsteram’ does not name a type ifsteram f=f.open("a+b.in"); ^ user.cpp:6:28: error: conversion from ‘void’ to non-scalar type ‘std::ofstream {aka std::basic_ofstream<char>}’ requested ofstream g=g.open("a+b.out"); ^ user.cpp: In function ‘int main()’: user.cpp:11:2: error: ‘f’ was not declared in this scope f>>a; ^