We ask the user which operation he wants to perform. Perform Addition/Subtraction/Multiplication/Division Operations on the two inputs.Īlso, Take input from the user to know which operation to perform: Take two integers as input: We declare two integer variables and read two variables using scanf. And here’s how we can interpret the problem statement. This is the kind of scenario where Switch works best. We have in front of us four choices/operations according to the program statement above, Addition/subtraction/multiplication/division. Solution: This is a classic use case of switch. Also, Take input from the user to know which operation to perform.Perform Addition/Subtraction/Multiplication/Division Operations on the two inputs.C program that implements a calculator that does the below If the input integer is not a value between 0-9 we wrote a default case to handle that scenario, we print ‘Invalid Digit’.Ģ.A switch statement is written with cases 0-9, and for each case, we print the corresponding English word for that digit.We took an input variable ‘digit’ from the user and read an integer using scanf.Below is a C program that implements this using switch. This is the example use case we discussed in the Introduction section of this article, we have already seen that this program can be implemented using the if.else if ladder. Given a digit from 0-9 print the English word for the digit using a C program Solution: So printf and break inside case 100/10 are executed and after the break, control comes outside the inner switch back to the outer switch.Īfter the Inner switch is evaluated, the break is executed in case 25/5Ĩ.Writing a continue statement inside a switch will not affect the flow, unlike a loop.ĩ.Finally, flower braces are not required for case/default statements and any statements written above the first case statement are ignored by switch. Switch(b)is evaluated and it matches with 100/10 So, switch starts executing all the statements below case 25/5. Switch(a) is evaluated and it matches with case 25/5 If the default block is not written in the switch then control comes out of switch and no case block is executed. If no match is found between in switch and s in case, thenĬontrol goes to default block if it exists( default is optional ), If break is not present after the matching case statements are executed, it will continue to execute all the statements in the below cases including default, till the end of switch statement. If a break is present after the matching case statements are executed, control will come out of the switch So, as seen in the above example, the flow of control in a switch is determined by the presence of break inside the case: Which interrupted the flow and control came out of the switch block. This is because there is a break statement following case 5. The output of the switch would be: I am Five. (This is a weird output, if we gave 9 as input, we only want to print I am Nine as output, so we have to write break immediately after printf(“I am Nine”) to stop the flow)įor instance, If the a value is 5 instead of 9 in the above switch block. Since there are no break statements(break is optional), all the statements following case 9 are executed. All the statements following case 9 are executed until a break statement or end of switch are encountered. Explanation: The a variable value is 9, this is compared against the case values, and a match is found.
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