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long long a = 1;
char msg[128] = "Default message";

/* ... */

printf("%d %s", a, msg);

Because a long long was not interpreted, if the architecture is set up in a way that long long uses more bits for storage, the subsequent format specifier %s will be unexpectedly offset, causing unknown data to be used instead of the pointer to the message.

Compliant Solution 2

This compliant solution adds in the length modifier ll to the %d format specifier so that the variadic function parser for printf() pulls the right amount of space off of the variable argument list for the long long argument.

long long a = 1;
char msg[128] = "Default message";

/* ... */

printf("%lld %s", a, msg);

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