Practical 09 answer.docx - UECS1643 Fundamentals Of...

UECS1643 Fundamentals Of Programming
Practical 9Answer Guidelines
Part A(Understanding Concepts)
1 Given the program below, answer the following questions.
(a) What is the output if the input is the following?
i
5
Alphanumeric character
Digit
ii P Alphanumeric character
Uppercase letter
iii (Tab key) Whitespace
iv g Alphanumeric character
Lowercase letter
v ? Some other character
(b) Why code
ch = getchar();
is
usedinstead of
cin>>ch; ?
Because object cin cannot be used to read whitespace
characters, for example space, tab, newline, etc. Whereas,
getchar() function can read all types of characters.
2
Given the program below, answer the following questions.
1

UECS1643 Fundamentals Of Programming
(a) What is the output if the input is the following?
i)
h
tolower of h returns h
toupper of h returns H
ii) Y tolower of Y returns y
toupper of Y returns Y
iii) 3 tolower of 3 returns 3
toupper of 3 returns 3
(b) What will be the output if a non-alphabet
character is sent to function tolower() or
toupper() ?
The tolower() or toupper() function will return back the
unchanged non-alphabet as output.
3 The following program displays a table showing the characters from a to z together with their ASCII codes.
(a) Run the program and observe the output.
2

UECS1643 Fundamentals Of Programming
(b) Modify the code above to get
the following output:
#include <iostream>
using namespace std;
int main(void)
{
char ch;
cout << "Letter\tASCII Code\n";
for (ch = 'Z'; ch >= 'A'; ch--)
cout<<" "<<ch<<"\t " << (int)ch<< endl;
return 0;
}
.
4.
s1 length: 4
s2length: 4
3

UECS1643 Fundamentals Of Programming
s1: good
s2 from 2nd element: job
s1: good job
s1: good job jo
5.
(a) -1
(b) 1
(c) 0
6.
0 1 1 1 1 1
-1 0 1 1 1 1
-1 -1 0 1 1 1
-1 -1 -1 0 1 1
-1 -1 -1 -1 0 1
-1 -1 -1 -1 -1 0
7.
The following program asks the user to enter a word. The program will display the word backward. It is assumed
that the word will not exceed 20 characters. The program displays the characters one by one starting from the last
character. Answer the following questions:
4

(a) Why header file <cstring> is included?
Function strlen() requires this header file
(b) What is the output if the word entered is
“program” ?