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The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

C Nested else if Statement

else if
  • In nested else if statement, the number of logical conditions can be checked for executing various statements.
  • If any logical condition is true the compiler executes the block under that else if condition, otherwise, it skips and executes else block.
  • By default else block will be executed, if all the remaining conditions are false.
  • It must be noted in nested else if statement, if more than one else if statement is true then the first else if statement which satisfies the condition in it will alone execute.

C Nested else if Syntax

Syntax Nested else if Statement

Syntax
if(test_expression 1)
{
here goes statements;
}
else if(test_expression 2)
{
here goes statements;
}
else
{
here goes statements;
}

else-if Flowchart

The following flowchart will clearly demonstrate, how else-if works?

else if flowchart

else if Statement Program

Lets take a look at the else if statement in action.

nestedif.c
#include <stdio.h> //header file section
int main()
{
int a;
printf("Enter a number: ");
scanf ("%d ", &a);
if(a > 0)
{
printf("\n%d is a positive number", a);
}
else if(a < 0)
{
printf("\n%d is a negative number", a);
}
else
{
printf("\n%d is a zero",a);
}
return 0;
}
  • Enter a number: -47
  • -47 is a negative number

Note:

Here, the compiler will ask user to enter the number, when user enters the number compiler will check if statement, as if statement resulted in false the compiler will check else if statement, as the condition is true compiler execute the block followed by else if statement and then exit.

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