Function prototypes and function definitions look similar because they have the same function heading. in a function prototype the heading is followed by a whereas in a function definition the heading is followed by a

In a function prototype the heading is followed by a semicolon, whereas in a function definition the heading is followed by a function block.

Explanation:

As the function prototype only declares the function and the function definition defines the operations in the function.

e.g:

add(int x, int y);  is the prototype

add(int x, int y)

{

     int sum;

     sum xy;

}    is the function definition.

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