C Decision control statement

tutorial and example
tutorial and example

Decision Making

C conditional statements are used to specify one or more conditions. The statements will be executed if the condition becomes true otherwise alternative statement will be executed if the condition becomes false.

C language supports the following statement:

  • If statement
  • Switch Statement
  • Conditional operator statement
  • goto statement

If statement

If statement is used to perform operation according to condition. In another words we can say that it is control the flow of execution of the statement. The condition may be true or false.

There are various ways to use if statement:

  • If statement
  • If-else statement
  • Else if.. Ladder

If Statement

In C language, if statement is used to execute the code if the condition is true.

The following syntax of if statement is:

 

Syntax:

Example

If- else statement:

If-else statement is used to execute the code if condition is true or false. The given following

 

Syntax of if-else statement:

If else-if ladder statement

It is used to execute the one code from multiple conditions.

Syntax:

Figure ?

Switch Statement

Switch statement is used to execute the code from multiple condition or case.

Following of the flow chart of the switch statement.

 

 

Syntax:

switch(expression)

{

case value-1:

block-1;

break;

case value-2:

block-2;

break;

case value-3:

block-3;

break;

case value-4:

block-4;

break;

default:

default-block;

break;

}

Rules for switch statement

The switch(expression) mustbe integer or character type.

  • We can use only byte, short, int, char data type with switch statement.
  • With switch statement not use float data type.
  • We can use any number of case statements within a switch.
  • The case value can be used only inside the switch statement.
  • Value for a case must be same as the variable in switch.

Let us consider an example

Example