{"id":13574,"date":"2020-07-24T14:34:09","date_gmt":"2020-07-24T21:34:09","guid":{"rendered":"https:\/\/careerkarma.com\/blog\/?p=13574"},"modified":"2023-12-01T03:56:04","modified_gmt":"2023-12-01T11:56:04","slug":"c-plus-plus-if-else","status":"publish","type":"post","link":"https:\/\/careerkarma.com\/blog\/c-plus-plus-if-else\/","title":{"rendered":"If Else in C++: A Step-By-Step Guide"},"content":{"rendered":"\n

If...else<\/code> is a conditional statement in C++. The C++ if<\/code> statement runs a block of code if a condition is met. An if...else<\/code> statement functions the same way but runs a second block of code if the condition is not met. If<\/code> and if...else<\/code> statements can be nested.<\/em><\/p>\n\n\n\n

\n\n\n\n

Conditional statements are an essential part of every programming language. Conditional statements allow developers to run code based on whether a particular condition is met in a program.<\/p>\n\n\n\n

In C++, if<\/code> <\/em>and <\/em>if \u2026 else<\/code> statements evaluate whether a statement is true or false and only run a block of code if the statement evaluates to true.<\/p>\n\n\n\n

This tutorial will discuss, using examples, the basics of C++ conditional statements and how to write if<\/code><\/em>, if \u2026 else<\/code><\/em>, and else if<\/code><\/em> statements in C++. By the end of this tutorial, you\u2019ll be an expert at using these statements in C++.<\/p>\n\n\n\n

C++ Conditional Statements<\/h2>\n\n\n\n

Developers use conditional statements to define the condition(s) on which a block of code will run. Whether a block of code in a conditional statement will run depends on whether a certain condition or set of conditions are met. Here are a few examples where conditional statements may be used:<\/p>\n\n\n\n

  • If a shopper has enough money in their account, a payment should be processed; if the shopper has insufficient funds, the payment should be declined.<\/li>
  • If a customer is over the age of 17, they should be allowed to see a movie; if not, they should be denied entry to the movie.<\/li>
  • If a bakery has less than 15 bags of flour in stock, a new case of flour should be ordered; if not, nothing should happen.<\/li><\/ul>\n\n\n\n

    In these cases, a certain action should only be performed if a condition is met. That\u2019s where if<\/code><\/em> and if \u2026 else<\/code><\/em> statements come in. <\/p>\n\n\n\n

    C++ if<\/em> Statement<\/h2>\n\n\n\n

    The C++ if<\/code> <\/em>statement evaluates whether an expression is true or false. If the expression evaluates to true, the program executes the code in the conditional statement; otherwise, the program does not execute the code in the conditional statement.   <\/p>\n\n\n\n

    Here\u2019s the syntax for an if<\/code> <\/em>statement: <\/p>\n\n\n\n

    if (expression) {\n\t\/\/ Code here\n}<\/pre><\/div>\n\n\n\n
    Let\u2019s walk through an example to illustrate how if<\/code> <\/em>statements work in C++. Suppose we are writing a program that calculates whether a bakery should order a new case of flour. If there are fewer than 15 bags of flour in inventory, a new case should be ordered.<\/p>\n\n\n\n
    We could use the following code to accomplish this task:<\/p>\n\n\n\n
    #include <iostream>\ninclude namespace std;\nint main() {\n\tint flourBagCount = 12;\n \tif (flourBagCount < 15) {\n\t\tcout << \"There are not enough bags of flour in inventory.\"\n\t}\n}<\/pre><\/div>\n\n\n\n
    When we run this code, the following is printed to the console: <\/p>\n\n\n\n
    There are not enough bags of flour in inventory.<\/pre><\/div>\n\n\n\n
    Let\u2019s break down this example. First we declare a variable called flourBagCount<\/code> that stores the number of bags of flour we have in inventory. Then we initialize an if<\/code> <\/em>statement that checks whether there are fewer than 15 bags of flour in inventory.<\/p>\n\n\n\n
    If the variable flourBagCount<\/code> is less than 15, the message There are not enough bags in inventory.<\/code> is printed to the console; otherwise, nothing happens. In this case, flourBagCount<\/code> is equal to 12, which is less than 15, so the program executes the code contained within the if<\/code> <\/em>statement. <\/p>\n\n\n\n
    C++ if \u2026 else<\/em> Statement<\/h2>\n\n\n\n
    When you\u2019re working with if<\/code> <\/em>statements, you may want your program to do something besides move on if the <\/em>statement evaluates to false.<\/p>\n\n\n\n
    if \u2026 else<\/code> <\/em>statements, like if<\/code> <\/em>statements, check for a condition. If that condition is met, the program executes the contents of the if<\/code><\/em> portion of the statement. However, unlike if<\/code><\/em> statements, in if \u2026 else<\/code> <\/em>statements, if the condition is not met, the contents of the else <\/em>statement execute. <\/p>\n\n\n\n
    Here\u2019s the syntax for an if \u2026 else<\/code> <\/em>statement: <\/p>\n\n\n\n
    if (expression) {\n\t\/\/ Run code\n} else {\n\t\/\/ Run other code\n}<\/pre><\/div>\n\n\n\n
    Let\u2019s take our bakery example from above. In our example, if there are fewer than 15 bags in stock, the program prints a message to the console telling the baker that there are not enough bags of flour in inventory. However, if there are enough bags of flour in inventory, nothing happens.<\/p>\n\n\n\n
    Suppose that we want a message to appear notifying the baker that there are enough bags of flour in inventory if there are 15 or more bags in stock. That\u2019s where we could use an if \u2026 else<\/code><\/em> statement. The following code would tell the program to print a certain message to the console if there are enough bags of flour in inventory: <\/p>\n\n\n\n
    #include <iostream>\ninclude namespace std;\nint main() {\n\tint flourBagCount = 16;\n \tif (flourBagCount < 15) {\n\t\tcout << \"There are not enough bags of flour in inventory.\"\n\t} else {\n\t\tcout << \"There are enough bags of flour in inventory.\"\n\t}\n}<\/pre><\/div>\n\n\n\n
    Our code returns: <\/p>\n\n\n\n
    There are enough bags of flour in inventory.<\/pre><\/div>\n\n\n\n
    In this example, we changed the value of flourBagCount<\/code> to 16. We also added an else<\/code> <\/em>statement to our code.<\/p>\n\n\n\n
    Because flourBagCount<\/code> is not less than 15, our if<\/code> <\/em>statement evaluates to false. This means that our program executes the contents of our else<\/code> <\/em>statement instead. As a result, our program prints the text, There are enough bags of flour in inventory.<\/code> to the console. <\/p>\n\n\n\n
    C++ allows for nested if statements, which is simply an if<\/code> or if...else<\/code> statement inside of another statement.  However, often a cleaner way to handle this need is often else if<\/code> statements. <\/p>\n\n\n\n
    C++ else if <\/em>Statement<\/h2>\n\n\n\n
    We have already discussed how to use an if<\/code> <\/em>statement to code a programmed response if a condition evaluates to true, and how to use an else<\/code> <\/em>block to run certain code if a preceding if<\/code><\/em> statement evaluates to false. But what if we want to check for multiple conditions and execute a block of statements if any of those conditions are true?<\/p>\n\n\n\n
    To check for multiple conditions in a program, we need to use a nested else if<\/code><\/em> statement. Here\u2019s the syntax of a nested else if<\/code><\/em> statement in C++: <\/p>\n\n\n\n
    if (expressionOne) {\n\t\/\/ Code to run if condition is true\n} else if (expressionTwo) {\n\t\/\/ Code to run if condition is false and expressionTwo is true\n} else {\n\t\/\/ Code to run if all test expressions are false\n}<\/pre><\/div>\n\n\n\n
    Let\u2019s walk through an example to discuss how the else if<\/code> <\/em>statement works.<\/p>\n\n\n\n
    Suppose we want to add a message to our bakery program from earlier that notifies our baker when the number of bags of flour in stock is equal to or greater than 15 and is equal to or less than 20. We want our program to do the following:<\/p>\n\n\n\n
    1. If there are over 20 bags of flour in stock, the program should print out a message that says, There are enough bags of flour in inventory.<\/code><\/li>
    2. If there are between 15 and 20 bags of flour in stock, the program should print out a message that says, A new order for flour should be placed soon.<\/code><\/li>
    3. If there are fewer than 15 bags of flour in inventory, the program should print out a message that says, There are not enough bags of flour in inventory.<\/code> <\/li><\/ol>\n\n\n\n
      We could use the following code for this program:<\/p>\n\n\n\n
      #include <iostream>\ninclude namespace std;\nint main() {\n\tint flourBagCount = 16;\n \tif (flourBagCount > 20) {\n\t\tcout << \"There are enough bags of flour in inventory.\"\n\t} else if (flourBagCount <= 20 && flourBagCount >= 15) {\n\t\tcout << \"A new order for flour should be placed soon.\"\n\t} else {\n\t\tcout << \"There are not enough bags of flour in inventory.\"\n\t}\n}<\/pre><\/div>\n\n\n\n
      Our code returns: <\/p>\n\n\n\n
      A new order for flour should be placed soon.<\/pre><\/div>\n\n\n\n
      In this example, our program checks for two conditions and includes an else<\/code> <\/em>statement that executes if those two conditions both evaluate to false.<\/p>\n\n\n\n
      In the first conditional statement in the above code, our program checks to see if the value of flourBagCount<\/code> is over 20. If it is, the message There are enough bags of flour in inventory.<\/code> is printed to the console.<\/p>\n\n\n\n
      If this statement evaluates to false, the else if<\/code><\/em> statement is evaluated. In this example, the else if<\/code> <\/em>statement checks to see whether the value of flourBagCount<\/code> is equal to or less than 20 and equal to or greater than 15. If both these statements are true, the message A new order for flour should be placed soon.<\/code> is printed to the console. This was the case–and outcome–of the above example.<\/p>\n\n\n\n
      If both of the if<\/code> <\/em>statements in our code (if<\/code><\/em> and else if<\/code><\/em>) evaluate to false, our program executes the code in the else<\/code> <\/em>statement. If this is the case, our program prints out the message, There are not enough bags of flour in inventory.<\/code> <\/p>\n\n\n\n
      Conclusion<\/h2>\n\n\n\n
      You can use if<\/code> <\/em>and if \u2026 else<\/code><\/em> statements to control the flow of a program in C++.<\/p>\n\n\n\n
      if<\/code> <\/em>statements evaluate whether a condition is true and execute certain code if so. else if<\/code><\/em> statements evaluate whether a second condition is true and execute certain code if so. else<\/code> <\/em>statements execute certain code if none of the specified conditions in an if<\/code> <\/em>statement evaluate to true.<\/p>\n\n\n\n
      This tutorial discussed, with examples, how to use if<\/code><\/em>, if \u2026 else<\/code><\/em>, and else if<\/code> <\/em>statements in C++. Now you\u2019re ready to start using these C++ conditional statements like a professional developer.<\/p>\n","protected":false},"excerpt":{"rendered":"If...else is a conditional statement in C++. The C++ if statement runs a block of code if a condition is met. An if...else statement functions the same way but runs a second block of code if the condition is not met. If and if...else statements can be nested. Conditional statements are an essential part of…","protected":false},"author":240,"featured_media":13576,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[17291],"tags":[],"class_list":{"0":"post-13574","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-c-plus-plus"},"acf":{"post_sub_title":"","sprint_id":"","query_class":"C++","school_sft":"","parent_sft":"","school_privacy_policy":"","has_review":null,"is_sponser_post":"","is_guest_post":""},"yoast_head":"\nIf Else in C++: A Step-By-Step Guide | Career Karma<\/title>\n<meta name=\"description\" content=\"The conditional statements (\u201cif\u201d and \u201cif \u2026 else\u201d) control the flow of a C++ program. 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