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C (Programming Language) [wiki] [cppreference] [백준] C is a general…

- - - - math.h
        
        Numerics
        
        Common Mathematical Functions
        
        sqrt
        [cppreference]
        
        Syntax : double sqrt(double arg)
        
        square root of arg is returned
        
        pow
        [cppreference]
        
        Syntax : double pow(double base, double exponent);
        
        base raised to the power of exponent is returned
        
        abs
        [cppreference]
        
        Syntax : int abs(int n);
        
        The absolute value of n, if it is representable.
      - stdlib.h
        
        Defines numeric conversion functions, pseudo-random numbers generation functions, memory allocation, process control functions
        
        Dynamic Memory Management
        
        malloc
        [cppreference]
        
        Syntax : void* malloc (size_t size);
        
        Allocates size bytes of uninitialized storage
        On success, returns the pointer to the beginning of newly allocated memory. To avoid a memory leak, the returned pointer must be deallocated with free() or realloc().
        On failure, returns a null pointer.
      - stdio.h
        
        Defines core input and output functions
        
        File input / output
        
        scanf (since C99)
        [cppreference]
        
        Syntax : int scanf(const char *restrict format, ...);
        
        printf(since c99)
        [cppreference]
        
        Syntax : int printf(const char *restrict format, ...);
- - - - C pointers
    - - Restrict
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