tutorial05.pptx - CSCI1120 Introduction to Compu ting Using...

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CSCI1120 Introduction to Compu ting Using C++ Tutorial 5 Li Le SHB 1013 lil @cse.cuhk.edu.hk 1
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Reminder of Quiz Date: Tue 18 Oct 2016 Time: 3:30pm - 4:30pm (1 hr) Venue: ERB 803 Scope: lec01 - lec06 Format: close-book, close-notes, written 2
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Outline Solutions to Selected Questions from Past Mid term Exam Papers 3
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Problem 1 (a) int x = 0; x = 4++; cout << x; Is this code valid? What is the output of this code? Analysis: 4 is a constant . We can only apply "+ +" and "--" operators to variables. Result: Invalid 4
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Problem 1 (b) int x = 10, z = 0; int y = ++x + z--; cout << "x = " << x << ", z = " << z << endl; cout << "y = " << y << endl; What is the output of this segment? Analysis: “++” “--” Prefix : returns value after increment/decrement Postfix : returns value before increment/decrement Result: 5
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Problem 1 (c) int a = 4; if (a > 0) cout << "A"; cout << "B"; else cout << "C"; cout << "D"; Result: Invalid Is this code valid? What is the output of this code? Analysis: The syntax of if-else statement only allows one single statement after the condition and before the "else" keyword . However, here we have two statements. How to make it valid? { } 6
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Problem 1 (d) cout << "////// \\\\\\"; Is this code valid? What is the output of this code? Analysis: String constant must be enclosed in double quotes within one line . Result: Invalid How to make it valid? String constant can extend to more than a single line of code by putting a backslash sign (\) at the end of each unfinished line .
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