c++ not java

vetens Question 1 1 Point As ir In C++, which of the following objects need to be used in order to open a file for reading purpose only! T ofstream ifstream iomanip iostream Gre Question 17 13 Points Write a function called "Replace_All that accepts two parameters: a matrix of 10x20 elements of type Integer and an integer value y. The function must: Replace every positive matrix element by the value +5. and Replace every negative matrix element by the value -5, and - Replace every zero by the value y Use the editor to format your