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const float pi = 3.14159f;
float degrees;
float radians;
/* ... */
radians = degrees * pi / 180;

Non-Compliant Code Example

This non-compliant code example, defines a fictional version of the standard strcat() function called strcat_nc(). This function differs from strcat() in that the second argument is not const-qualified.

char *strcat_nc(char *s1, char *s2);

char *str1 = "str1";
const char *str2 = "str2";
char str3[] = "str3";
const char str4[] = "str4";

strcat_nc(str1, str2);  /* different 'const' qualifiers */
strcat_nc(str3, str1); 
strcat_nc(str4, str3);  /* different 'const' qualifiers */

The function behaves the same as strcat(), but results in extraneous warnings when the second argument is a const-qualified argument.

Compliant Solution

In this compliant solution, pi is declared as a const-qualified object.

const float pi = 3.14159f;
float degrees;
float radians;
/* ... */
radians = degrees * pi / 180;

Risk Assessment

Failing to const-qualify immutable objects can result in a constant being modified at runtime.

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