Rule Definition
The use of increment and decrement operators in combination with other operators is not recommended because: • It can significantly impair the readability of the code; • It introduces additional side effects into a statement with the potential for undefined behavior It is safer to use these operators in isolation from any other arithmetic operators

Remediation
Use increment decrement operators in isolation from the other side-effects

Violation Code Sample

The expression:
u8a = u8b++
is non-compliant. The non-compliant expression statement:
u8a = ++u8b + u8c--;
____________________
The following are all non-compliant because they contain a function call as well as an increment or
decrement operator:
if ( ( f ( ) + --u8a ) == 0u )
{
}
g ( u8b++ );
The following are all non-compliant even though the sub-expression containing the increment or
decrement operator or some other side eff ect is not evaluated:
u8a = ( 1u == 1u ) ? 0u : u8b++;
if ( u8a++ == ( ( 1u == 1u ) ? 0u : f ( ) ) )
{
}
___________________________________________________________________________________________________

Fixed Code Sample

++u8b;
u8a = u8b + u8c;
u8c--;
______________
The following are all compliant because the only side eff ect in each expression is caused by the
increment or decrement operator.
x++;
a[ i ]++;
b.x++;
c->x++;
++( *p );
*p++;
( *p )++;

Standards Reference: MISRA C 2012, 13.1: A full expression containing an increment (++) or decrement (--) operator should have no other potential side effects other than that caused by the increment or decrement operator MISRA C++ 2008, 5-2-10: The increment (++) and decrement (--) operators should not be mixed with other operators in an expression