Explain the difference between call by refrence and call by value?
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Posted On: Jan 08, 2021
The difference between call by reference and call by value
| Parameters | Call by value | Call by reference |
|---|---|---|
| Definition | While calling a function, when you pass values by copying variables, it is known as "Call By Values." | While calling a function, in programming language instead of copying the values of variables, the address of the variables is used it is known as "Call By References. |
| Arguments | A copy of the variable is passed in this method. | A variable itself is passed in this method. |
| Alteration of value | It does not allow you to make any changes in the actual variables. | It allows you to make changes in the values of variables by using function calls. |
| Effect | Changes made in a copy of the variable never modify the value of the variable outside the function. | Change in the variable also affects the value of the variable outside the function. |
| Alteration of value | It does not allow you to make any changes in the actual variables. | It allows you to make changes in the values of variables by using function calls. |
| Passing of variable | Values of variables are passed using a straightforward method. | Pointer variables are required to store the address of variables. |
| Value modification | Original value not modified. | The original value is modified. |
| Memory Location | Actual and formal arguments will be created in different memory location | Actual and formal arguments will be created in the same memory location |
| Safety | Actual arguments remain safe as they cannot be modified accidentally. | Actual arguments are not Safe. They can be accidentally modified, so you need to handle arguments operations carefully. |
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