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Undefined behavior

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Undefined behavior:
*Undefined behavior
*Dereferencing a pointer to variable beyond its lifetime
*Copying overlapping memory
*Signed integer overflow
*Use of an uninitialized variable
*Read value of pointer that was freed
*Data race
*Modify string literal
*Using incorrect format specifier in printf
*Modifying any object more than once between two sequence points
*Passing a null pointer to printf s conversion
*Bit shifting using negative counts or beyond the width of the type
*Freeing memory twice
*Accessing memory beyond allocated chunk
*Returning from a function thats declared with Noreturn or noreturn function specifier
*Addition or subtraction of pointer not properly bounded
*Modifying a const variable using a pointer
*Dereferencing a null pointer
*Reading an uninitialized object that is not backed by memory
*Using fflush on an input stream
*Division by zero
*Missing return statement in value returning function
*Inconsistent linkage of identifiers
*Conversion between pointer types produces incorrectly aligned result
*Modifying the string returned by getenv strerror and setlocale functions
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