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| 1 | +// Question# 1 |
| 2 | +// Declare a variable called age & assign to it your age. Show |
| 3 | +// your age in an alert box. |
| 4 | + |
| 5 | +var age = 5; |
| 6 | +alert("I am" + " " + age + " " + "years old."); |
| 7 | +console.log("I am" + " " + age + " " + "years old."); |
| 8 | + |
| 9 | +// Question# 2 |
| 10 | +// Declare & initialize a variable to keep track of how many |
| 11 | +// times a visitor has visited a web page. Show his/her |
| 12 | +// number of visits on your web page. For example: “You |
| 13 | +// have visited this site N times”. |
| 14 | + |
| 15 | +var visit_count; |
| 16 | +visit_count = 10; |
| 17 | +alert("You have visited this site" + " " + visit_count + " " + "times."); |
| 18 | +console.log("You have visited this site" + " " + visit_count + " " + "times."); |
| 19 | + |
| 20 | +// Question# 3 |
| 21 | +// Declare a variable called birthYear & assign to it your |
| 22 | +// birth year. Show the following message in your browser: |
| 23 | + |
| 24 | +var birth_year = 2015; |
| 25 | +document.write("My birth year is" + " " + birth_year + "<br/>"); |
| 26 | +document.write( |
| 27 | + "Data type of my declared variable is number" + "<br/>" + "<br/>" |
| 28 | +); |
| 29 | + |
| 30 | +// Question# 4 |
| 31 | +// Declare 3 variables in one statement. |
| 32 | +var age; |
| 33 | +var year; |
| 34 | +var date; |
| 35 | + |
| 36 | +// Question# 5 |
| 37 | +// Declare 5 legal & 5 illegal variable names. |
| 38 | +// ============================================== |
| 39 | +// 5 Legal Variable name |
| 40 | +var firstName; |
| 41 | +var last_name; |
| 42 | +var Full$Name; |
| 43 | +var _birthDate; |
| 44 | +var $person_name; |
| 45 | +// ============================================== |
| 46 | +// 5 Illegal Variable name |
| 47 | +// var 1firstUser; // number can't be written in the first of variable name. |
| 48 | +// var &modelName; // symbols can't be used in teh starting of variable name. |
| 49 | +// var user id; //spaace is not allowed between varibale name it throws bugs. |
| 50 | +// var class; //reserved key is not being used because it has already been reserved and cannot used as variable it throws error. |
| 51 | +// var car*name; //special characters cannot be used between variable but $ sign can be used. |
| 52 | + |
| 53 | +// Question# 6 |
| 54 | +// Display this in your browser |
| 55 | +// a) A heading stating “Rules for naming JS variables” |
| 56 | +var rules_for_JS = "Rules for naming JS variables" + "<br/>" + "<br/>"; |
| 57 | +document.write(rules_for_JS); |
| 58 | + |
| 59 | +// b) Variable names can only contain ______, ______, ______ and ______. For example $my_1stVariable |
| 60 | + |
| 61 | +var variable_rules = |
| 62 | + "Variable names can only contain _ , $ and number For example: $person_name1 " + |
| 63 | + "<br/>" + |
| 64 | + "<br/>"; |
| 65 | +document.write(variable_rules); |
| 66 | + |
| 67 | +// c) Variables must begin with a ______, ______ or _____. For example $name, _name or name |
| 68 | +var vari_start_with = |
| 69 | + "Variables must begin with a letter, _ or $. For example $person, _person or person" + |
| 70 | + "<br/>" + |
| 71 | + "<br/>"; |
| 72 | +document.write(vari_start_with); |
| 73 | + |
| 74 | +// d) Variable names are case _________ |
| 75 | +var variable_cases = "Variable names are case sensitive " + "<br/>" + "<br/>"; |
| 76 | +document.write(variable_cases); |
| 77 | + |
| 78 | +// e) Variable names should not be JS _________ |
| 79 | +var variable_name = |
| 80 | + "Variable names should not be JS keywords." + "<br/>" + "<br/>"; |
| 81 | +document.write(variable_name); |
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