Question

Short circuit evaluation is when the language evaluates the first portion of a BOOLEAN expression and if, knowing the result of the value, then skips the evaluation of the second expression. For example, A & B is false if A is false... no need to evaluate B. A similar scenario is true for OR. Most languages implement short circuit evaluation

create a program for the following languages: FORTRAN

Write the summary of your result

An example could look like:

function f()

{ write('I have been evaluated');
      return(1);

}

main()
{   int i=1;

if ( i ==0 && f() )
then write ('true')
else   write ('false)

} 33

Answer 1

Given the above example following is the summary for the same.

function f()

{ write('I have been evaluated');
      return(1);

}

main()
{   int i=1;

if ( i ==0 && f() )
then write ('true')
else   write ('false)

}

In the above case, as i is not equal to 0, thus it will calculate f() thus "i have been evaluated" string will be printed.
Then as the function is returning 1, so it will print true.

Next Example:

function f()

{ write('I have been evaluated');
      return(1);

}

main()
{   int i=1;

if ( i ==1 && f() )
then write ('true')
else   write ('false)

}

So in the above case as the i is equal to 1 thus the next statement i.e evaluation of f() is not done. Then it will print only true.

Example:

function f()

{ write('I have been evaluated');
      return(1);

}

main()
{   int i=1;

if ( i ==1 || f() )
then write ('true')
else   write ('false)

}

In this case too as i is equal to 1, thus it will not calculate the function as there is an OR operator. Thus it will simply print "true" but not "I have been evaluated"

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