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Finished Homework
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‎force-app/main/default/classes/VariablesDataTypesOperators.cls‎

Lines changed: 140 additions & 31 deletions
Original file line numberDiff line numberDiff line change
@@ -18,7 +18,7 @@
1818
* If statements are not specifically covered in the lesson this module, but review module 2 flow control section for an overview if needed.
1919
* Resources: https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/langCon_apex_if_else.htm
2020
*
21-
* @author Your Name
21+
* @author Naveen Tariq
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*/
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public with sharing class VariablesDataTypesOperators {
@@ -32,7 +32,14 @@ public with sharing class VariablesDataTypesOperators {
3232
* @return The sum of the two numbers, or null if either number is null.
3333
*/
3434
public static Integer addition(Integer a, Integer b) {
35-
return null; // Replace null with the variable you used to store the result
35+
if (a== null || b == null){ // Check if either of the numbers is null
36+
System.debug('Numbers are null.'); // If it is then print this message
37+
return null; // End the code and return null
38+
} else{
39+
Integer sum = a + b; //Otherwise add a and b to get the sum
40+
Systerm.debug (sum); // Print the sum to the debug log
41+
}
42+
return sum; // Replace null with the variable you used to store the result
3643
}
3744

3845
/**
@@ -44,8 +51,15 @@ public with sharing class VariablesDataTypesOperators {
4451
* @return The difference between the two numbers.
4552
*/
4653
public static Integer subtraction(Integer a, Integer b) {
47-
return null; // Replace null with the variable you used to store the result
54+
if (a ==null || b == null){ // Good Practise to check if either of the numbers is null
55+
System.debug('Numbers are null.'); // Print the message
56+
return null; // End the code and return null
57+
} else {
58+
Integer sub = a - b; // Otherwise substract the numbers
59+
System.debug(sub); // Print the result to the debug log
60+
return sub; // Replace null with the variable you used to store the result
4861
}
62+
}
4963

5064
/**
5165
* Question 3
@@ -56,8 +70,15 @@ public with sharing class VariablesDataTypesOperators {
5670
* @return The product of the two numbers.
5771
*/
5872
public static Integer multiplication(Integer a, Integer b) {
59-
return null; // Replace null with the variable you used to store the result
73+
if (a == null || b == null){ // Good practise to check if either of the numbers is null
74+
System.debug('Numbers are null.');
75+
return null; // End the code to avoid errors
76+
}else{
77+
Integer multiply = a * b; // Multiplay the numbers
78+
System.debug(multiply); // Print multplication
79+
return multiply; // Replace null with the variable you used to store the result
6080
}
81+
}
6182

6283
/**
6384
* Question 4
@@ -69,8 +90,13 @@ public with sharing class VariablesDataTypesOperators {
6990
* @return The quotient of the division, or 0 if the denominator is zero.
7091
*/
7192
public static Double division(Double a, Double b) {
72-
return null; // Replace null with the variable you used to store the result
93+
if (b == 0) { //Check if the denominator is zero
94+
return 0; // if it is then return 0
95+
}else{
96+
Double divisionResult = a / b; // The quotient of the division,
97+
return divisionResult; // Replace null with the variable you used to store the result
7398
}
99+
}
74100

75101
/**
76102
* Question 5
@@ -83,7 +109,16 @@ public with sharing class VariablesDataTypesOperators {
83109
* @return True if the number is even, False otherwise.
84110
*/
85111
public static Boolean isEven(Integer num) {
86-
return null; // Replace null with the variable you used to store the result
112+
Integer remainder = num / 2; //Check if the number is even or odd.If you divde a nuber by 2 and the remainder is 0 then the number is even.
113+
//Another method; Math.mod (x,y) it divides variable x by y and gives the remainder
114+
//Integer remainder = Math.mod(num, 2);
115+
Boolean result; //Check true or false
116+
if (remainder == 0) { // if its 0 its even then return true
117+
result = true;
118+
}else{
119+
result = false; //Otherwise its false
120+
}
121+
return remainder; // Replace null with the variable you used to store the result
87122
}
88123

89124
/**
@@ -94,7 +129,16 @@ public with sharing class VariablesDataTypesOperators {
94129
* @return true if the number is positive, false otherwise.
95130
*/
96131
public static Boolean isPositive(Integer num) {
97-
return null; // Replace null with the variable you used to store the result
132+
if (num == null) { // Step 1: First check if the number is not null to avoid errors
133+
System.debug('Number is null.');
134+
}
135+
Boolean result; //Bollean to checkif the statement is true or false
136+
if ( num > 0){ // Check if number is greater than 0
137+
result = true; //Then the number is positive so return true
138+
}else{ //Otherwise its negative
139+
result = false;
140+
}
141+
return result; // Replace null with the variable you used to store the result
98142
}
99143

100144
/**
@@ -106,7 +150,9 @@ public with sharing class VariablesDataTypesOperators {
106150
* @return The concatenated string.
107151
*/
108152
public static String concatenateStrings(String str1, String str2) {
109-
return null; // Replace null with the variable you used to store the result
153+
String concatenatedString = str1 + str2; //Concatenat/ combine str1 and str2 to remove space in between them
154+
System.debug(concatenatedString);
155+
return concatenatedString; // Replace null with the variable you used to store the result
110156
}
111157

112158
/**
@@ -121,7 +167,9 @@ public with sharing class VariablesDataTypesOperators {
121167
* @return The complete sentence as a single String.
122168
*/
123169
public static String createSentence(String noun, String verb, String endingPunctuation) {
124-
return null; // Replace null with the variable you used to store the result
170+
String sentence = 'The' + noun + 'is' + verb + endingPunctuation; //Form a sentence by concatenating all the variables
171+
System.debug('Sentence:' + sentence);
172+
return sentence; // Replace null with the variable you used to store the result
125173
}
126174

127175
/**
@@ -134,7 +182,17 @@ public with sharing class VariablesDataTypesOperators {
134182
* @return True if the date is in the past, False otherwise.
135183
*/
136184
public static Boolean isDateInPast(Date dt) {
137-
return null; // Replace null with the variable you used to store the result
185+
Date todayDate = Date.today(); //Fetch today's date
186+
Boolean dateInPast; //Declare a Boolean variable to check if the date is in the past
187+
if (dt == null) { // Good practise to check if the date is null
188+
System.debug('Date is null.'); // if null print the message
189+
return false; // End the code to avoid errors
190+
}else if (dt <todayDate){ // if the date is less than today's date then its in the past
191+
dateInPast = true;
192+
}else{ //otherwise it is not in the past
193+
dateInPast = false;
194+
}
195+
return dateInPast; // Replace null with the variable you used to store the result
138196
}
139197

140198
/**
@@ -147,7 +205,17 @@ public with sharing class VariablesDataTypesOperators {
147205
* @return True if the date is today or in the future, False otherwise.
148206
*/
149207
public static Boolean isDateTodayOrFuture(Date dt) {
150-
return null; // Replace null with the variable you used to store the result
208+
Date todayDate = Date.today(); //Fetch today's date
209+
Boolean dateInFutureOrToday; //Declare a Boolean variable to check if the date is infuture or today
210+
if (dt == null) { // Good practise to check if the date is null
211+
System.debug('Date is null.'); // if null print the message
212+
return false; // End the code to avoid errors
213+
}else if (dt >= todayDate){ // if the date is equalo or greater thab today's date then its in future or today
214+
dateInFutureOrToday = true;
215+
}else{ //otherwise it is not in future or today
216+
dateInFutureOrToday = false;
217+
}
218+
return dateInFutureOrToday; // Replace null with the variable you used to store the result
151219
}
152220

153221
/**
@@ -159,11 +227,16 @@ public with sharing class VariablesDataTypesOperators {
159227
* @param minutes The number of minutes.
160228
* @return The number of milliseconds equivalent to the given number of minutes.
161229
*/
162-
Integer MILLISECONDS_PER_MINUTE = null; // Make this value a constant
230+
Integer MILLISECONDS_PER_MINUTE = 60000; // Make this value a constant
163231
public static Integer convertMinutesToMilliseconds(Integer minutes) {
164-
Integer milliseconds;
165-
return null; // Replace null with the variable you used to store the result
166-
}
232+
if (minutes == null) { // Good practise to check if the minutes is null
233+
System.debug('Minutes is null.');
234+
return 0; // End the code to avoid errors and return 0
235+
}else{
236+
Integer milliseconds = minutes * MILLISECONDS_PER_MINUTE; //Multiply the minutes by the constant to get the milliseconds
237+
return milliseconds; // Replace null with the variable you used to store the result
238+
}
239+
}
167240

168241
/**
169242
* Question 12
@@ -176,8 +249,14 @@ public with sharing class VariablesDataTypesOperators {
176249
* @return The average of the three numbers.
177250
*/
178251
public static Double averageOfThreeNumbers(Integer a, Integer b, Integer c) {
179-
return null; // Replace null with the variable you used to store the result
252+
if (a == null || b == null || c == null) { // Good practise to check if the numbers are null
253+
System.debug(' Numbers are null.');
254+
return 0; // End the code to avoid errors and return 0
255+
}else{
256+
Double average = (a + b + c ) / (3);
257+
return average; // Replace null with the variable you used to store the result
180258
}
259+
}
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182261
/**
183262
* Question 13
@@ -191,10 +270,10 @@ public with sharing class VariablesDataTypesOperators {
191270
*/
192271
public static Integer adjustOrderOfOperations1(Integer a, Integer b, Integer c) {
193272
// Add parentheses around the addition operation so that it is performed before multiplication
194-
Integer result = a + b * c;
273+
Integer result = (a + b) * c;
195274

196275
// Return the result
197-
return null; // Replace null with the variable you used to store the result
276+
return result; // Replace null with the variable you used to store the result
198277
}
199278

200279
/**
@@ -206,8 +285,8 @@ public with sharing class VariablesDataTypesOperators {
206285
// Add parentheses in the below expression to change the result.
207286
// The result of the expression as it is right now is 43.
208287
// You should add parentheses so that the result of the expression becomes 8.
209-
Integer answer = 48 - 15 + 5 * 2;
210-
return null; // Replace null with the variable you used to store the result
288+
Integer answer = 48 - (15 + 5)* 2;
289+
return answer; // Replace null with the variable you used to store the result
211290
}
212291

213292
/**
@@ -226,9 +305,9 @@ public with sharing class VariablesDataTypesOperators {
226305
*/
227306
public static Double complexOrderOfOperations(Integer a, Integer b, Integer c, Integer d, Integer e) {
228307
// Add parentheses around the multiplication and subtraction operations so that they are performed before division and addition
229-
Double result = a * b - c / (Double) d + e;
308+
Double result = (a * b - c) / (Double) d + e; // I dont understand this Double here and how to check this in Execute Annonymous Window?
230309

231-
return null; // Replace null with the variable you used to store the result
310+
return result; // Replace null with the variable you used to store the result
232311
}
233312

234313
/**
@@ -239,14 +318,19 @@ public with sharing class VariablesDataTypesOperators {
239318
* @return The temperature in Celsius equivalent to the given Fahrenheit temperature.
240319
*/
241320
public static Double convertFahrenheitToCelsius(Double fahrenheit) {
242-
final Double SUBTRACT_FACTOR = 32.0;
321+
final Double SUBTRACT_FACTOR = 32.0; //What is final?
243322
final Double MULTIPLY_FACTOR = 5.0;
244323
final Double DIVIDE_FACTOR = 9.0;
324+
if (fahrenheit == null) { // Good practise to check if the numbers are null
325+
System.debug('Fahrenheit is null.');
326+
return null;
327+
}else{
328+
Double celsius = ((fahrenheit - SUBTRACT_FACTOR) * MULTIPLY_FACTOR / DIVIDE_FACTOR);
245329

246-
return null; // Replace null with the variable you used to store the result
330+
return celsius; // Replace null with the variable you used to store the result
331+
}
247332
}
248333

249-
250334

251335
/**
252336
* Question 17
@@ -260,10 +344,15 @@ public with sharing class VariablesDataTypesOperators {
260344
public static Integer performDivisionAndCast(Double a, Double b) {
261345
// Perform the division and cast (round down) off the result.
262346
Double divisionResult = null;
263-
347+
if (b == null) { // Check if the b is null
348+
System.debug('Denominator is null');
349+
return null;
350+
} // Return null if division is not possibl
264351
// Write the code for type casting the divisionResult to an Integer
352+
divisionResult = a / b;
265353
Integer roundedResult = null;
266-
return null; // Replace null with the variable you used to store the result
354+
roundedResult = (Integer) divisionResult;
355+
return roundedResult; // Replace null with the variable you used to store the result
267356
}
268357

269358
/**
@@ -277,7 +366,12 @@ public with sharing class VariablesDataTypesOperators {
277366
*/
278367
public static Decimal calculateWeeklyPaycheck(Decimal hourlyRate, Double numberOfHours) {
279368
// Calculate the weekly paycheck using the formula: rate multiplied by hours
280-
return null; // Replace null with the variable you used to store the result
369+
if (hourlyRate == null || numberOfHours == null) { // Good practise to check if the numbers are null
370+
System.debug('Numbers are null.');
371+
return null; // End the code to avoid errors and return null
372+
}
373+
Decimal weeklyPaycheck = hourlyRate * numberOfHours; // Otherwise Calculate the weekly paycheck using the formula: rate multiplied by hours
374+
return weeklyPaycheck; // Replace null with the variable you used to store the result
281375
}
282376

283377
/**
@@ -291,20 +385,35 @@ public with sharing class VariablesDataTypesOperators {
291385
* @return A Decimal representing the monthly paycheck.
292386
*/
293387
public static Decimal calculateMonthlyPaycheck(Decimal hourlyRate, Double numberOfHours) {
294-
return null; // Replace null with the variable you used to store the result
388+
if (hourlyRate == null || numberOfHours == null) { // Good practise to check if the numbers are null
389+
System.debug('Numbers are null.');
390+
return null; // End the code to avoid errors and return null
391+
}
392+
Decimal weeklyPaycheck = hourlyRate * numberOfHours; //First Calculate the weekly paycheck using the formula: rate multiplied by hours
393+
Decimal monthlyPaycheck = weeklyPaycheck * 4; // Now multiply the weekly paycheck by 4 to get the monthly paycheck
394+
return monthlyPaycheck; // Replace null with the variable you used to store the result
295395
}
296396

297397
/**
298398
* Question 20
299399
* Calculates the total cost based on price per unit, number of units, and a sales tax rate.
300-
* Total cost is calculated by the formula: (pricePerUnit * numberOfUnits) * (1 + salesTaxRate).
400+
* Total cost is calculat(pricePerUnit * numberOfUnits) * (1 + salesTaxRate).ed by the formula:
301401
* Example: calculateTotalCost(1.0, 2, 0.05) should return 2.1
302402
* @param pricePerUnit The price per unit of the item.
303403
* @param numberOfUnits The number of units purchased.
304404
* @param salesTaxRate The sales tax rate as a decimal (e.g., 0.05 for 5% tax).
305405
* @return The total cost after applying the sales tax.
306406
*/
307407
public static Decimal calculateTotalCost(Decimal pricePerUnit, Integer numberOfUnits, Decimal salesTaxRate) {
308-
return null; // Replace null with the variable you used to store the result
408+
409+
if (pricePerUnit == null || numberOfUnits == null || salesTaxRate == null) { // Good practise to check if the numbers are null
410+
System.debug('Numbers are null.');
411+
return null; // End the code to avoid errors and return null
412+
}
413+
Decimal totalCost = (pricePerUnit * numberOfUnits) * (1 + salesTaxRate);
414+
// Calculate the total cost using the formula
415+
return totalCost; // Replace null with the variable you used to store the result
309416
}
310417
}
418+
419+

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