Answer to Question #174494 in C for Kwame Hay

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Answer to Question #174494 in C for Kwame Hay

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Programming & Computer Science>

C

Question #174494

Question 2

A) The AIT canteen wants you to write a script for them which would do the following

I) receive records from the user and keep these records into a file, the records must include

 ID

 Name of meal

 Price of meal

 Quantity bought today

 Sales made for the day

3

Today the sales person wants to make seven entries into the file via the command line interface.

Your script should be able to find to present the sales person with the ability to

 Search for a particular meal by ID

 Search for a particular meal by name

 find out how much money has been made from the sales of a particular meal

 list all records

 list all meals and their prices

 list a particular meal and its price

[10marks]

B) With a shell script explain how to use case

[9marks]

C) With code explain how the following work

 if statements

 if else statements

 if elif else fi statements

[4 marks]

D) Explain the difference between= grep -i "some string" some file and

grep -iw "some string" some file

Expert's answer

A)

results = {

weak_sent: [

"row 1 data",

"row 2 data"

],

weak_sent_num: [1,2]

}

function generate_table() {

// get the reference for the body

var body = document.getElementsByTagName("body")[0];

// creates a <table> element and a <tbody> element

var tbl = document.createElement("table");

//var header = document.createElement("header");

// var header = '<tr><th>Country</th><th>City</th></tr>';

var header= document.createElement('thead')

var headingRow = document.createElement('tr')

var headingCell1 = document.createElement('td')

var headingText1 = document.createTextNode('country')

headingCell1.appendChild(headingText1)

headingRow.appendChild(headingCell1)

var headingCell2 = document.createElement('td')

var headingText2 = document.createTextNode('City')

headingCell2.appendChild(headingText2)

headingRow.appendChild(headingCell2)

header.appendChild(headingRow)

tbl.appendChild(header)

//var header = "<th>Header</th>";

var tblBody = document.createElement("tbody");

// creating all cells

for (var i = 0; i < results.weak_sent.length; i++) {

// creates a table row

var row = document.createElement("tr");

for (var j = 0; j < 2; j++) {

// Create a <td> element and a text node, make the text

// node the contents of the <td>, and put the <td> at

// the end of the table row

var cell = document.createElement("td");

if (j == 0) {

var cellText = document.createTextNode(results.weak_sent_num[i]);

} else {

var cellText = document.createTextNode(results.weak_sent[i]);

}

cell.appendChild(cellText);

row.appendChild(cell);

}

// add the row to the end of the table body

tblBody.appendChild(row);

}

// This is for the quick solution

// tbl.innerHTML = header

// put the <tbody> in the <table>

tbl.appendChild(tblBody);

// appends <table> into <body>

body.appendChild(tbl);

// sets the border attribute of tbl to 2;

tbl.setAttribute("border", "2");

}

generate_table()

B) CASE

A case construct is used to simplify nested if statement. Here, it reads a variable value, and matches the value with all case and finds out the matching pattern. Syntax starts with keyword 'case' and ends with 'esac'

ANIMAL="cat"

case "$ANIMAL" in

"cow") echo "cow gives milk"

;;

"dog") echo "dog is lovely"

;;

"cat") echo " cat is cute "

;;

esac

C) SHELL SCRIPT TO FIND GREATEST OF TWO NUMBERS USING

IF STATEMENT

ELSE IF STATEMENT &

IF ELIF ELSE FI STATEMENT

p=5

q=12

if [ $p == $q ]

then

echo "p is equal to q"

elif [ $p -gt $q ]

then

echo "p is greater than q"

elif [ $p -lt $q ]

then

echo "p is less than q"

else

echo "None of the condition met"

fi

IF STATEMENT will process if specified condition is true
ELSE IF STATEMENT : if specified condition in if doesnt work, then else part will be processed
IF ELIF ELSE FI STATEMENT: If multiple conditions in one if-else block is needed, then elif keyword is used in shell. If expression1 is true then it executes statement 1 and 2, and this process continues. If none of the condition is true then it processes else part.

D)

grep -i "some string" some file

MEANING:

grep :- print lines matching a pattern

grep -i :- print lines matching a pattern which is case insensitive

RESULT: Matches all lines of the file named 'some-file' which contains the string 'some-string'.

grep -iw "some string" some file

MEANING:

grep :- print lines matching a pattern

grep -iw :- WORD grep that print lines matching a pattern with given WORD

RESULT: Matches all lines of the file named 'some-file' which contains the string 'some-string' as a single WORD

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