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If else and switch case both are used to control the flow of program.
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What is the similarity between 'if' statement ans 'switch' statement?
A Switch statement can be considered as a series of if. else if. else statements. whatever condition is satisfied, the code block would get executed. if (cond 1) { } else if (cond 2) { } else if (cond 3) { } ...... } else if (cond N) { } else { } switch { case 1: .... case 2: .... .... case N: ... default: ... } Difference: In the if else blocks, if one condition is satisfied, all other blocks are ignored In Switch blocks, unless you have break statements inside each condition block, the subsequent blocks would not be ignored.
What is difference between if else and switch statement in c plus plus?
Switch Case is used when you want to check whether a certain variable is equal to a set of particular values and theres a different task to do for each value. If-then-else is can be used to check for anything, including a range of values and perform a specific task if the condition is met. For eg: switch(c) { case(1): task1(); break; case(2): task2(); break; case(3): task3(); break; default: task9(); break; } if(c>=1 && c<=9) task1(); else task2(); Note: You cannot use >= or <= in switch case.
What are decision making constructs in c?
if else and switch case satements
What is the difference between switch case and if else?
If else can have values based on constraints, where as switch case can have values based on user choice.In if else, first condition is verified, then it comes to else whereas in the switch case first it cheaks the case and then it switches to that particular case.
What is the use of the default case in a switch case?
The default case in a switch statement will be activated if none of the other case values match. It is used exactly for this purpose - if nothing else matches in the switch then this one will always match.Without a default case value, if nothing matched in the switch then nothing will be done. Sometimes it is necessary to know that nothing matched.
How if else if statement is differ from switch in general in java?
An else statement is comparing to items, while a switch statement is used to compare multiple items. So if you need multiple results from one statement use a switch but for booleans or very specific functions use a if else statement. Else If ex. if(a=6){System.out.println("It is six");} else(){System.out.println("It is not six");} Switch ex. switch(a){ case 1: System.out.println("it is one"); break; case 2: System.out.println("it is two"); break; default: System.out.println("it is not one or two"); break; } Basically a switch is a good way to check against a lot of possibilities.
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Write an equivalence of switch statement and if statement?
switch(ch) { case '+': ....cout <<"arithmetic operator"; ....break; //<===break is a must /// <====================other cases . . default: // <=======else }
How do you turn a if statement to a switch statement?
Old: if (condition) stmt1; else stmt2; New: int cc = (condition)!=0; switch (cc) { case 1: stmt1; break; case 0: stmt2; break; }
Which one gives better execution to the program switch or if else?
There is no difference between switch and if-else. A modern optimizing compiler should be able to generate the same code in both cases.
What are five advantages to using case structure to program multiple alternative decisions?
1. Switch/case structures yield cleaner, more maintainable code than equivalent nested if..else statements. 2. With if...else statements, the programmer must put the most likely cases first. With switch/case structure, the order of the cases is immaterial. 3. The default switch/case label can be placed anywhere. With if...else, the default must be placed last. 4. Where multiple cases contains common (duplicate) code, omitting the break statement allows execution to fall through to the common code. With if...else, the common code must be duplicated. 5. Switch/case is as fast if not faster than equivalent nested if...else statements. However, modern compilers can optimise nested if...else statements into an equivalent switch/case structure wherever appropriate, thus the speed advantage is much less of a concern these days. Whenever you have the option of using one or the other, use switch/case if only to make code more readable. However, there will be cases where an if...else may be more readable. For instance, consider the following examples: void f (const char c) { if (c>='a' && c<='z') {} else if (c>='A' && c<='Z') {} else if (c>='0' && c<='9') {} else {} } void g (const char c) { switch (c) { case 'a': case 'b': ... case 'y': case 'z': {} break; case 'A': case 'B': ... case 'Y': case 'Z': {} break; case '0': case '1': ... case '8': case '9': {} break; default: {} } } Typing out all the cases in function g would obviously be tiresome and error prone compared to the succinct statements of function f. However, a good compiler will generate the same code regardless of which function you use, so the choice is simply one of which is the most readable.
What is the difference between If-else and Switch-case in Java?
The if statement is used to select among two alternatives. It uses a boolean expression todecide which alternative should be executed. The switch statement is used to select among multiple alternatives. It uses an int expression to determine which alternativeshould be executed.
