Difference between declaration and Definition

Declaration
It just indicate the presence of a variable or memberfunction and ends with a semi-colon.

For eg;
int i;-->declaration
add();--->declaration

Definition
It explains the behaviour of the function.If it is a variable it defines its value.

For eg:
int i=2;--->It is definition of a variable
add()--------->Definition
{
int a=2,b=3,c;
c=a+b;
}

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