The difference is that the Select-Case statement can make the code simpler to read and work with than IF. false takes up to two arguments and once both are provided(see currying), it returns the second argument given.Select-Case statements work like IF.true takes up to two arguments and once both are provided (see currying), it returns the first argument given.In Lambda calculus, the concept of an if-then-else conditional can be expressed using the expressions: This is known as the dangling else problem, and is resolved in various ways, depending on the language (commonly via the end if statement or Lambda calculus Without clear boundaries for which statement is which, an else keyword could target any preceding if–then statement in the nest, as parsed.ĭepending on whether the else is associated with the first if or second if. The next program will prompt the user to select the key A-D and the program will respond by telling the. The else keyword is made to target a specific if–then statement preceding it, but for nested if–then statements, classic programming languages such as ALGOL 60 struggled to define which specific statement to target. Creating a Select-Case statement is simple to do. Cls Input Enter the numbers between 1-3 N Select case N Case 1 Print It’s number 1 Case 2 Print It’s a number 2 Case 3 Print It’s a number 3 Case else Print It’s out of range End select End Q 11. Write a program to check the numbers between 1 & 3. #Select case programs in qbasic modStructured if–then–else statements like the example above are one of the key elements of structured programming, and they are present in most popular high-level programming languages such as C, Java, JavaScript and Visual Basic. Cls Input Enter any number N RN mod 2 Select case R Case 0 Print The number is Even number Case Else Print The number is odd number End Select End Q 10. While it is possible while using only GOTO statements in if–then statements to write programs that are not spaghetti code and are just as well structured and readable as programs written in a structured programming language, structured programming makes this easier and enforces it. Such mechanisms and principles were based on the older but more advanced ALGOL family of languages, and ALGOL-like languages such as Pascal and Modula-2 influenced modern BASIC variants for many years. The difference is that the Select-Case statement can make the code simpler to read and work with than If statements. As a result, structured programming, which allows (virtually) arbitrary statements to be put in statement blocks inside an if statement, gained in popularity, until it became the norm even in most BASIC programming circles. 1.02K subscribers Select-Case statements work like If statements. Division' PRINT 'Option No.: ' INPUT opt CLS SELECT CASE opt CASE 1 PRINT 'You have selected. #Select case programs in qbasic downloadDownload Sinan Sakic Diskografija Rapidshare here. This led to a hard-to-read style of programming known as spaghetti programming, with programs in this style called spaghetti code. SELECT CASE is used to determine the program flow by comparing the value of a variable to specific CASE values. In early programming languages, especially some dialects of BASIC in the 1980s home computers, an if–then statement could only contain GOTO statements (equivalent to a branch instruction). Otherwise, the execution continues in the following branch – either in the else block (which is usually optional), or if there is no else branch, then after the end If.Īfter either branch has been executed, control returns to the point after the end If. If the condition is true, the statements following the then are executed. When an interpreter finds an If, it expects a boolean condition – for example, x > 0, which means "the variable x contains a number that is greater than zero" – and evaluates that condition. CLS INPUT Enter your name:, Name SELECT CASE Name CASE Ted PRINT. In contrast, the combination of this expression, the If and Then surrounding it, and the consequent that follows afterward constitute a conditional statement, having intrinsic meaning (e.g., expressing a coherent logical rule) but no intrinsic value. QBASIC - QBASIC is more like conventional programming languages than Logo. In the example code above, the part represented by (boolean condition) constitutes a conditional expression, having intrinsic value (e.g., it may be substituted by either of the values True or False) but having no intrinsic meaning. Although the syntax varies from language to language, the basic structure (in pseudocode form) looks like this: The if–then construct (sometimes called if–then–else) is common across many programming languages.
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