Differentiate Pass by reference and pass by value parameter passing scheme?

Answer 1

parameter passing :

the value of the variable is passed to the called function,but the passed value cant be changed by the function.

ex:

int main()

{

int a,b;

a=5;

foot(a);

printf("%d",a);

}

void foot(int x)

{

x=7;

}

here the value of a ie.5 is passed to the function foot(),and the value 5 is printed since the value of tat variable cant be changed ...

here the address of the variable is send to the function,the function can change its value.

ex:

int main() {

int a,b;

a=5;

b=7;

foot(&a,&b);

printf("%d%d",a,b);

}

void foot(int *x,int *y)

{

*x=6;

*y=8;

}

here the address of a is assigned to x and address of b to y,so by using this more values can be referenced..here &a means it is pointing to an address,*x means it is an indirection pointer tat points indirectly to the or tat references indirectly the value of a.

hence x references a and y references b.