Diagnostics & Limits

Diagnostic and limit headers, such as <assert.h> and <limits.h>, provide tools for catching bugs and understanding platform constraints. The assert macro checks that a condition holds true during development and aborts the program with a message if it does not, while <limits.h> defines constants like INT_MAX describing the range of values each integer type can hold on the current platform. These are used more during development and debugging than in a program's normal runtime logic.