Control flow of statement:

You have already known that execution of a C program will start from main function (more specifically- from the opening curly brace followed by int main). You may face a situation where you have to break the conventional sequence of execution.Controlling the execution sequence of statements is called Control flow of statement.

Explanation: Suppose you want to print “Evil company corrupts good morals” 10 times. You may write code as follows:

OUTPUT

Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals

Now if there is a trick to repeat

this line 10 times it will be more efficient. Fortunately there are some trick to do this. In C program it is called loop. Loop can repeat a statement or a block of statements. There are three looping system in C program: for loop,while loop, do while loop. Now we do the above program with for loop:

OUTPUT

Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals
Evil company corrupts good morals

NOTE:

Here we simply show how a for loop can reduced 10 line code into one line. Next section we will discuss all flow control of statement such as for loop, while loop, do while loop, if, else if, else, switch case etc with explanation.


Next Previous