input facility

output facility

both input and output facilities

no input and output facilities

local variables

internal variables

external variable

global variables

int

unsigned

int

unsigned

finds hypotenuse of triangle with sides a + 2 and b+3

finds square root of (a + 2)2 + (b + 3)2

is meaningless

finds square root of 3*a + 4*b + 5

cannot be initialized

is initialized once at the commencement of execution and cannot be changed at run time

retains its value throughout the file of the program

is same as an automatic variable but is placed at the head of a program