Synopsis

(Required) Expressions of essentially character type shall not be used inappropriately in addition and subtraction operations.

Enabled by default

Yes

Severity/Certainty

Medium/Medium

Full description

Expressions of essentially character type were found used inappropriately in addition and subtraction operations.

Coding standards

Code examples

The following code example fails the check and will give a warning:

void example(void) {
  char a = '9';
  char c = a + '0';
}

The following code example passes the check and will not give a warning about this issue:

void example(void) {
  int a = 9; 
  char dig = a + '0';
}