In this guide, we will discuss Fortran Nested If Construct. 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 −
if ( logical_expression 1) then
!Executes when the boolean expression 1 is true
…
if(logical_expression 2)then
! Executes when the boolean expression 2 is true
…
end if
end if
Example
program nestedIfProg
implicit none
! local variable declaration
integer :: a = 100, b= 200
! check the logical condition using if statement
if( a == 100 ) then
! if condition is true then check the following
if( b == 200 ) then
! if inner if condition is true
print*, "Value of a is 100 and b is 200"
end if
end if
print*, "exact value of a is ", a
print*, "exact value of b is ", b
end program nestedIfProg
When the above code is compiled and executed, it produces the following result −
Value of a is 100 and b is 200 exact value of a is 100 exact value of b is 200
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