Decision making in C Programming

C  programming  language  assumes  any non-zero and non-null values  as true, and if it is  either zero or null, then it is assumed as false value.C  programming  language  provides  the  following  types  of  decision-making statements.

•   if Statement 

An if statement  consists  of  a  Boolean  expression  followed  by  one  or  more statements.

• if…else Statement 

An if statement  can  be  followed  by  an  optional else statement, which  executes when the Boolean expression is false.
Syntax 
The syntax of an if...else statement in C programming language is:

•  if...else if...else Statement 

An if statement can be followed by an optional else  if...else statement, which is very useful to test various conditions using single if...else if statement.
Syntax 

•  Nested if Statements 

It is always legal in C programming to nest if-else statements, which means you can use one if or else if statement inside another if or else if statement(s).
Syntax 
The syntax for a nested if statement is as follows:

                              

•  Switch Statement 

A switch statement allows a variable  to be  tested  for equality against a  list of values.  Each  value  is  called  a  case,  and  the  variable  being  switched  on  is checked for each switch case.
Syntax 
The syntax for a switch statement in C programming language is as follows:

Loops and Conditions Statements in C programming

An if statement consists of a Boolean expression followed by one or more statements. 
An if statement can be followed by an optional else statement, which executes when the Boolean expression is false. An if statement can be followed by an optional else if...else statement, which is very useful to test various conditions using single if...else if statement.

It is always legal in C programming to nest if-else statements, which means you can use one if or else if statement inside another if or else if statement(s).
A switch statement allows a variable to be tested for equality against a list of values. Each value is called a case, and the variable being switched on is checked for each switch case.

A while loop in C programming repeatedly executes a target statement as long as a given condition is true.
Unlike for and while loops, which test the loop condition at the top of the loop, the do...while loop in C programming checks its condition at the bottom of the loop. A do...while loop is similar to a while loop, except the fact that it is guaranteed to execute at least one time.