Pass by value and reference

Pass by value:

• Here the values of actual parameters are copied into the formal parameters of the function.
• This can also means that the calling function sends a copy of each value to the called function.
• In this method ,the changes of the formal parameters cannot affect the actual parameters.

/*Sample program on pass by value:*/

• From this program it is clear that when ever value is passed to a function it cannot be modified in the called function.

Pass by Reference:

• In Pass by reference method we are passing address to a called function.
• when address is send to the function value at the address can be modified in the called function.
• To modify value of a variable in a function send its address to the function.

/*sample program on pass by reference*/