Quick Answer: What Is The Difference Between Case And If Statement?

What is the difference between else if and if?

Use if to specify a block of code to be executed, if a specified condition is true.

Use else to specify a block of code to be executed, if the same condition is false.

Use else if to specify a new condition to test, if the first condition is false..

What is the difference between if and for statement?

An if statement checks if an expression is true or false, and then runs the code inside the statement only if it is true. The code inside the loop is only run once… A while statement is a loop. Basically, it continues to execute the code in the while statement for however long the expression is true.

Is else necessary after ELSE IF?

4 Answers. The ending else is not mandatory. As for whether it is needed, it depends on what you want to achieve. The trailing else clause will execute when none of the specified conditions is true.

What is the difference between conditions that control loops and conditions that control if statements?

O Conditions That Control Loops Cannot Contain Logical Operators There Is No Difference Conditions In Loops Can Be Either Boolean Or Int Values, Such As Int I = 5; While(i)… Conditions In If Statements Can Be Either Boolean Or Int Values, …

Why while loop is better than for loop?

The main reason that While is much slower is because the while loop checks the condition after each iteration, so if you are going to write this code, just use a for loop instead.

What is the difference between switch case and if statements?

The key difference is, if-else statement evaluates a condition, if it turns out to be true then only the if block would be executed otherwise else block. On other hand, Switch statement evaluates certain values provided by a user and runs a particular ‘case’ block accordingly.

Do While VS while?

Contrast with the while loop, which tests the condition before the code within the block is executed, the do-while loop is an exit-condition loop. This means that the code must always be executed first and then the expression or test condition is evaluated. If it is true, the code executes the body of the loop again.

Under what circumstances would an IF ELSE IF statement be a more appropriate choice than a switch statement?

Use switch every time you have more than 2 conditions on a single variable, take weekdays for example, if you have a different action for every weekday you should use a switch. Other situations (multiple variables or complex if clauses you should Ifs, but there isn’t a rule on where to use each.

Should you use switch statements?

Switch statements are cleaner syntax over a complex or stacked series of if else statements. Use switch instead of if when: You are comparing multiple possible conditions of an expression and the expression itself is non-trivial. You have multiple values that may require the same code.

How does if else work?

The if/else statement executes a block of code if a specified condition is true. … Use else to specify a block of code to be executed, if the same condition is false. Use else if to specify a new condition to test, if the first condition is false. Use switch to select one of many blocks of code to be executed.

What is the point of ELSE IF?

else if would be faster in the sense that you compare until you hit a condition that resolves to true, and you skip the rest of the if s. Also consider reordering the compares in order of descending frequency. And using the switch statement depending on the datatype of the object you are comparing.

Is Break statement necessary in switch case?

Not every case needs to contain a break. If no break appears, the flow of control will fall through to subsequent cases until a break is reached. A switch statement can have an optional default case, which must appear at the end of the switch. … No break is needed in the default case.

Are switch statements Bad?

Case statement is used for conditional operations. … Switch case is not a bad syntax, but its usage in some cases categorizes it under code smell. It is considered a smell, if it is being used in OOPS. Thus, Switch case should be used very carefully.

Which is faster case or if statement?

A switch statement is usually more efficient than a set of nested ifs. … Speed: A switch statement might prove to be faster than ifs provided number of cases are good. If there are only few cases, it might not effect the speed in any case.

Is switch faster than if?

As it turns out, the switch statement is faster in most cases when compared to if-else , but significantly faster only when the number of conditions is large. The primary difference in performance between the two is that the incremental cost of an additional condition is larger for if-else than it is for switch .

Which is faster if else or switch?

General rule is use switch whenever the number of conditions is greater than 3 (for readability). if / else if / else is more flexible (hence better), but switch is slightly faster because it just computes the condition once and then checks for the output, while if has to do this every time.

What are the limitations of switch case statement?

Disadvantages of switch statementsfloat constant cannot be used in the switch as well as in the case.You can not use the variable expression in case.You cannot use the same constant in two different cases.We cannot use the relational expression in case.

Which one is better switch case or else if ladder?

The switch case is more compact than lot of nested else if. … Another difference between switch case and else if ladder is that the switch statement is considered to be less flexible than the else if ladder, because it allows only testing of a single expression against a list of discrete values.