COS110 Tutorial 1 -18July2011-MEMO

COS110 Tutorial 1 -18July2011-MEMO - University of Pretoria...

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University of Pretoria COS110 Tutorial 1 MEMO-MEMO-MEMO Date: 20 July 2011 Time: 50 minutes Marks: 42 Student Surname and Initials:__________________________________________________ Student number:_______________________ Employee number:_____________________ Question 1: (Topic: scope of program elements) [6 marks] Study the program below and answer the questions that follow. //C++ code in file main.C #include <iostream> using namespace std; int cube(int x); int main(void) { int number; for (number = 1; number <= 10; number++) cout << number << cube(number) << endl; return 0; } int cube(int x) { int xCubed; xCubed = x * x * x; return xCubed; } Questions: a. What is meant by the terms file scope and function scope? b. State the scope (file scope or function scope) of each of the following elements. If you specify function scope you should also state the name of the function where the element has scope (is accessible). i. variable number
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ii. function prototype int cube(int x) iii. parameter int x iv. variable int xCubed Solutions: a. file scope means that any function in the file has access to the element. Functions scope means that only one function has access to the element. (2 marks) b. Scope for: (4 marks) i. variable number: function main ii. function prototype int cube(int x): file scope iii. parameter int x: function cube iv. variable int xCubed: function cube Question 2: (Topic: dynamic memory allocation) [5 marks] Write C++ statements to do the following: a. Declare a pointer variable numPtr which can store the address of an integer. (1 mark) Solution: int *numPtr; b. Allocate a block of memory from the heap to store 10 integer values and store the start address of the block in the variable numPtr . (1 mark) Solution: numPtr = new int[10];
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COS110 Tutorial 1 -18July2011-MEMO - University of Pretoria...

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