Changes the value of data to something else, so foo() returns something other than 123, and hence printf() also prints a different value to stdout. Essentially reading/writing to the test program process memory.
Российский врач вернется к работе после истекшей кровью пациентки14:48
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Now, let's imagine our library is adopted by larger applications with their own specific needs. On one hand, we have Application A, which requires our bytes to be serialized as hexadecimal strings and DateTime values to be in the RFC3339 format. Then, along comes Application B, which needs base64 for the bytes and Unix timestamps for DateTime.
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