Call by value is a method of parameter passing used in programming. When we use this method, the values of current parameters are copied into formal parameters of the function, and they are stored in different memory locations. So, any changes made to the formal parameters within the functions are not reflected in the current parameters of the caller. This is a widely used convention where the caller evaluates the parameters’ values and passes them to the callee’s formal parameters.
Simply put, in the call-by-value method, the value of the actual parameters is copied to the formal parameters. Therefore, the value of the variable in the function call is used in the called function. The formal parameter cannot change the actual parameter’s value.
Since the memory is allocated differently for the current and formal parameters, a different memory location is used for the formal parameter in the function. The current parameter is the argument used in the function call, whereas the formal parameter is the argument used in the function definition.
In call-by-value parameter passing, the caller will copy the value of a current parameter into the corresponding formal parameter’s memory slot or register in the caller’s ar. The name of the formal parameter refers to this value, and if any changes are made to the caller’s value, they are visible in the caller, but not in the invoker.
FAQs
What is Call by Value?
Call by Value is a parameter passing method in programming, where the values of current parameters are copied into formal parameters of the function, and they are stored in different memory locations. Any changes made to the formal parameters within the functions are not reflected in the current parameters of the caller.
What is the difference between Call By Value and Call By Reference?
Call by Value method copies the values of the current parameters into Formal Parameters, whereas Call by Reference method copies the memory address of the current parameters into Formal Parameters.
Where is Call By Value method used?
Call by Value parameter passing is a widely-used convention in programming. It is used when the function does not need to modify the original values of the current parameters.
Conclusion
Call by Value is a widely used method of parameter passing in programming. When using this convention, any changes made to the formal parameters within the functions are not reflected in the current parameters of the caller. This convention is used when functions do not need to modify the original values of the current parameters.
