In-class notes for 09/17/2018

CS 251 (SD), Fall 2018

• hw4

• Quiz Wednesday

• Reading question form now available - see links in homework
  Submit at least one question per reading, from now on
  mark as "high priority" when desired

Quiz topics for Wednesday:

• Memory diagrams. See the puzzles page for the in-class puzzles with solutions we've shown in class.

  • Note that the quiz memory-diagram problems will focus on your understanding of how the computer carries out C++ instructions, so there won't be information you couldn't know, e.g., the ASCII code for letter 'o', or how roundoff error gives an unexpected result in the answer to FloatExample.cpp

• C++ programming with variable definitions, assignments, cout output, etc. Standard types (int, long, float, double, char), basic operators (+, -, *, /, =), syntax for basic structure of a program.

Reading questions

Some definitions:

• A function is a procedure of computer actions that may have 0 or more arguments and 0 or 1 return values.

• A function call is a language expression for causing a function to perform its computer actions. E.g., sqrt(3).

• The scope of an identifier is the range of code in which that identifier has meaning.

• The state change of a function consists of all effects that function has, apart from its return value.

• An operator is a function with specialized syntax for its calls. In C++, an operator call (such as x+3) can alternatively be written using th usual syntax for a function call (e.g., operator+(x, 3).

Puzzles

• Groups

• Example: Memory diagram for

  #include <iostream >
  using namespace std;
  int add1(int n) {
    return n+1;
  }
  int main() {
    float pi = 3.14;
    int z;
    z = add1(pi);
    cout << pi << " " << z << endl;
  }
  

• Func1.cpp
• Func2.cpp

hw5