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2 answers:
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Answer:
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 x
y;
} is the function definition.
Remember Ohm's law 
. Plugging in the information gives you 
amperes of current.