Question

Differentiate between function declaration and variable declaration

Answer 1

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When we declare the variable we using externkeyword, and decalretion is do outside the main() function.
ex-
extern int a;  // extern is work as globle, int is data type and a is variable

but the definition for the variable is we define variable with there data type
ex-
int a;  //int is data type and a is variable

function declaration-  
 
return_type  function_name();
ex-  int sum();
In the declaration we just provide function name,return not write body.

definition of function 
here we write the body of fuction what the work.
ex-
int sum(){
  c=a+b;
  return c;
}

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