{"id":192,"date":"2022-01-04T11:43:02","date_gmt":"2022-01-04T11:43:02","guid":{"rendered":"https:\/\/www.kindsonthegenius.com\/scala\/?p=192"},"modified":"2022-01-04T11:43:02","modified_gmt":"2022-01-04T11:43:02","slug":"scala-conditional-statements","status":"publish","type":"post","link":"https:\/\/www.kindsonthegenius.com\/scala\/scala-conditional-statements\/","title":{"rendered":"Scala – Conditional Statements"},"content":{"rendered":"

In this chapter, you will learn how to use conditional statements. We would cover the following conditional statements:<\/p>\n

    \n
  1. if Statement<\/a><\/li>\n
  2. if-else Statement<\/a><\/li>\n
  3. Multiple if-else Statement<\/a><\/li>\n
  4. Nested if-else Statement<\/a><\/li>\n<\/ol>\n

     <\/p>\n

    1. if Statement<\/strong><\/h4>\n

    The if statement is use to evaluate a conditional expression and has the syntax:<\/p>\n

    if<\/span>(<\/span>expression)<\/span> {<\/span>\r\n   \/\/ Execute if true<\/span>\r\n}<\/span>\r\n<\/pre>\n
    If the expression evaluates to true, then the code inside the block is executed. Otherwise, the code is skipped.<\/p>\n
    An example program is given below. Try to enter and run it using your compiler.<\/p>\n
    object<\/span> ConditionDemo<\/span> {<\/span>\r\n   def<\/span> main(<\/span>args:<\/span> Array<\/span>[<\/span>String<\/span>])<\/span> {<\/span>\r\n      var<\/span> age =<\/span> 10<\/span>;<\/span>\r\n\r\n      if<\/span>(<\/span> age <<\/span> 15<\/span> ){<\/span>\r\n         println(<\/span>\"He is young\"<\/span>);<\/span>\r\n      }<\/span>\r\n   }<\/span>\r\n}<\/span>\r\n<\/pre>\n
     <\/p>\n
    2. if-else Statement<\/strong><\/h4>\n
    For the if-else statement, we have a conditional expression, then we have two blocks of code:<\/p>\n
      \n
    • if block<\/strong> – executes if the expression evaluates to true<\/li>\n
    • else block<\/strong> – executes if the expression evaluates to false<\/li>\n<\/ul>\n
      The code below is an example of how the if-else statement works<\/p>\n
      object<\/span> ConditionDemo<\/span> {<\/span>\r\n   def<\/span> main(<\/span>args:<\/span> Array<\/span>[<\/span>String<\/span>])<\/span> {<\/span>\r\n      var<\/span> age =<\/span> 10<\/span>;<\/span>\r\n\r\n      if<\/span>(<\/span> age <<\/span> 15<\/span> ){<\/span>\r\n         println(<\/span>\"He is a child\"<\/span>);<\/span>\r\n      }<\/span>\r\n      else<\/span> {<\/span>\r\n         println(<\/span>\"He is an adult\"<\/span>);<\/span>\r\n      }<\/span>\r\n\r\n   }<\/span>\r\n}<\/span>\r\n<\/pre>\n
       <\/p>\n
      3. Multiple if-else Statement<\/strong><\/h4>\n
      In this case, an if statement is followed by one or more else-if-else. This is used to test a series of possible conditions using one statement. An example would be assigning the grades of students based on their scores e.g 70 – 100 is A, 60 – 69 is B etc.<\/p>\n
      Also note that if one of the if statements evaluates to true, then the remaining statements are skipped.<\/p>\n
      object<\/span> ConditionDemo<\/span> {<\/span>\r\n  def<\/span> main(<\/span>args:<\/span> Array<\/span>[<\/span>String<\/span>])<\/span> {<\/span>\r\n    var<\/span> score =<\/span> 50<\/span>;<\/span>\r\n\r\n    if<\/span>(<\/span> score ==<\/span> 70<\/span> ){<\/span>\r\n      println(<\/span>\"Excellent!\"<\/span>);<\/span>\r\n    }<\/span> \r\n    else<\/span> if<\/span>(<\/span> score ><\/span> 49<\/span> ){<\/span>\r\n      println(<\/span>\"Average performance\"<\/span>);<\/span>\r\n    }<\/span> \r\n    else<\/span> if<\/span>(<\/span> score ><\/span> 30<\/span> ){<\/span>\r\n      println(<\/span>\"Not so good\"<\/span>);<\/span>\r\n    }<\/span> \r\n    else<\/span>{<\/span>\r\n      println(<\/span>\"He Failed!!\"<\/span>);<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/pre>\n
      In this example, the compiler starts by checking the first conditional expression (score == 70), then subsequently checks other expression if the result of the previous is false. So the output would be “Average Performance”. At this point, subsequent expressions are skipped.<\/p>\n
       <\/p>\n
      4. Nested if-else Statement<\/strong><\/h4>\n
      In this case we would have if-else statements nested within another if-else statement. Here, each of the if blocks is treated separately.<\/p>\n
      object<\/span> NestedDemo<\/span> {<\/span>\r\n   def<\/span> main(<\/span>args:<\/span> Array<\/span>[<\/span>String<\/span>])<\/span> {<\/span>\r\n      var<\/span> a =<\/span> 100<\/span>;<\/span>\r\n      var<\/span> b =<\/span> 200<\/span>;<\/span>\r\n      \r\n      if<\/span>(<\/span> a ==<\/span> 100<\/span> ){<\/span>\r\n         if<\/span>(<\/span> b ==<\/span> 200<\/span> ){<\/span>\r\n            println(<\/span>\"A = 100 and B = 200\"<\/span>);<\/span>\r\n         }<\/span>\r\n      }<\/span>\r\n   }<\/span>\r\n}<\/span>\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
      In this chapter, you will learn how to use conditional statements. We would cover the following conditional statements: if Statement if-else Statement Multiple if-else Statement … <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-192","post","type-post","status-publish","format-standard","hentry","category-scala-programming"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.kindsonthegenius.com\/scala\/wp-json\/wp\/v2\/posts\/192","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kindsonthegenius.com\/scala\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kindsonthegenius.com\/scala\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kindsonthegenius.com\/scala\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kindsonthegenius.com\/scala\/wp-json\/wp\/v2\/comments?post=192"}],"version-history":[{"count":2,"href":"https:\/\/www.kindsonthegenius.com\/scala\/wp-json\/wp\/v2\/posts\/192\/revisions"}],"predecessor-version":[{"id":194,"href":"https:\/\/www.kindsonthegenius.com\/scala\/wp-json\/wp\/v2\/posts\/192\/revisions\/194"}],"wp:attachment":[{"href":"https:\/\/www.kindsonthegenius.com\/scala\/wp-json\/wp\/v2\/media?parent=192"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kindsonthegenius.com\/scala\/wp-json\/wp\/v2\/categories?post=192"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kindsonthegenius.com\/scala\/wp-json\/wp\/v2\/tags?post=192"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}