# Use of Logical Operators in C

C allows usage of three logical operators, namely, &&, || and !. These are to be read as ‘AND’ ‘OR’ and ‘NOT’ respectively

## Consider the following example

The marks obtained by a student in 5 different subjects are input through the keyboard. The student gets a division as per the following rules

Percentage above or equal to 60 – First division
Percentage between 50 and 59 – Second division
Percentage between 40 and 49 – Third division
Percentage less than 40 – Fail

Write a program to calculate the division obtained by the student

```main( )
{
int m1, m2, m3, m4, m5, per ;
printf ( "Enter marks in five subjects " ) ;
scanf ( "%d %d %d %d %d", &m1, &m2, &m3, &m4, &m5 ) ;
per = ( m1 + m2 + m3 + m4 + m5 ) / 5 ;
if ( per >= 60 )
printf ( "First division ") ;
else
{
if ( per >= 50 )
printf ( "Second division" ) ;
else
{
if ( per >= 40 )
printf ( "Third division" ) ;
else
printf ( "Fail" ) ;
}
}
}
```

## The else if Clause

There is one more way in which we can write program

```main( )
{
int m1, m2, m3, m4, m5, per ;
per = ( m1+ m2 + m3 + m4+ m5 ) / per ;
if ( per >= 60 )
printf ( "First division" ) ;
else if ( per >= 50 )
printf ( "Second division" ) ;
else if ( per >= 40 )
printf ( "Third division" ) ;
else
printf ( "fail" ) ;
}
```