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In this noncompliant code example, the average() function is called as follows:

int avg = average(1, 4, 6, 4, 1);

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This compliant solution enforces the contract by adding va_eol as the final argument.

int avg = average(1, 4, 6, 4, 1, va_eol);

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Another common mistake is to use more conversion specifiers than supplied arguments, as shown in this noncompliant coding example.

const char *error_msg = "Resource not available to user.";
/* ... */
printf("Error (%s): %s", error_msg);

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This compliant solution matches the number of format specifiers with the number of variable arguments.

const char *error_msg = "Resource not available to user.";
/* ... */
printf("Error: %s", error_msg);

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