4 Kinds of Statement Flow Control in C Programming – Easy notes

Hey learner, Welcome to my blog, in this article I will discuss Statement Flow Control in C Programming. So lets start!

Follow this link to read fundamentals of statements and about C programming:

Statement Flow Control in C Programming

A statement is a combination of letters and symbols in C programming which ends with a semicolon. The sequence or order of statements is known as statement flow control in C programming. It is very essential for every programming language to use proper order of sequence of statements to be executed.

In the next section of Statement Flow Control in C Programming, I will talk about the constructs provided by C programing.

Constructs in C Programming

As every programming provides three main constructs so as C programming too. They are:

1. Sequence
2. Selection
3. Iteration

Now understands these constructs for Statement Flow Control in C Programming.

Sequence

The sequence is a normal and simple construct of C programming. It is just a sequence of statements written in the program. Consider this example:

void main()
{
printf("Hello, this is sequence construct\n")
printf("The sequence of normal statement is considered as a sequence construct.")
}

Selection

Select refers to the statements where a programmer has to select a condition. It is based on different conditions. The example are:

1. Simple if
2. If-else
3. If-else ladder
4. Switch

Now lets undersand these constructs in detail with example for Statement Flow Control in C Programming.

Simple if

It checks only one condition and executes the statements if it evaluates to true, otherwise does nothing. The syntax of C programming is as following:

if (test-condition)
{
     Statements;
}

Example:

if (n==0)
{
   printf(“You have entered 0”)
}

Watch this video for more understanding:

If-else statement in C programming

The if-else statement is another control flow statement in C programming. If the statement evaluated to true it will execute the first part, if the condition evaluates to false it will execute the else part. Look at the syntax:

if (condition)
{
 statements;
}
else
{
 statements;
}

As you have observed many real-life situations where there are two possibilities arise. Either this or that! For example, when you are trying to do login with your e-mail account or any social media, you are entering your username and password. The system checks the username and password entered by use on-screen with the stored username and password. If both matches it will render your profile/inbox page.

Just have look at the example:

#include<stdio.h>
#include<conio.h>
void main()
{ un=8912;
  pwd=123;
  clrscr();
  printf("Enter your username:");
  scanf("%d",&un);
  printf("Enter your password:");
  scanf("%d",&pwd);
  if(un==8912 && pwd==123)
  {
    printf("Welcome %d",un);
  }
  else
  {
   print("Incorrect username and/or password")
  }
  getch();
}

Similarly, another condition is there when you are going to check whether the entered number is odd or even! Observe this code:

#include<stdio.h>
#include<conio.h>
void main()
{
  int n;
  clrscr();
  printf("Enter your number:");
  scanf("%d",&n);
  if(n%2!=0)
  {
    printf("%d is odd number");
  }
  else
  {
   printf("%d is even number");
  }
  getch();
}

Watch this video for more understanding:

Iteration

Iteration or looping is also a very important part of C programming. The repetition of statements according to the condition is known as iteration. It can be considered as a cycle where steps are executed until specific conditions will be satisfied.

There are three types of iterations used in C programming:

1. While
2. Do…While
3. For