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Switch statements

This 'switch' statement does not contain a 'default' clause. This could be dangerous if the controlling expression has an unexpected value.

For example: 


/*PRQA S 2017,3120,3227,3408 ++*/

extern int foo(int n)
{
    int r = 0;

    switch (n)
    {
    case 1:
        r = 5;
        break;

    case 3:
        r = 10;
        break;

    case 5:
        r = 20;
        break;
    }                                   /* Message 2002 */

    return r;
}

MISRA-C:2004 Rules applicable to message 2002:

Rule  15.3  (Required) The final clause of a switch statement shall be the default clause.

QA·C Source Code Analyser 8.1
MISRA-C:2004 Compliance Module 3.2
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