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| Basic |
A copy of the variable is passed. | A variable itself is passed. |
| Effect | Change in a copy of variable doesn't modify the original value of variable out side the function. | Change in the variable affect the value of variable outside the function also. |
| Calling Parameters | function_name(variable_name1, variable_name2, . . . .); | function_name(&variable_name1, &variable_name2, . . . .); //in case of object object.func_name( object); |
| Receiving Parameters | type function_name(type variable_name1, type variable_name2, . . . .) { . . } |
type function_name( type *variable_name1, type *variable_name2, . . . .){ . . } //in case of object type function_name(class_type object_name) { . . } |
| Default calling | primitive type are passed using "call by value". | objects are implicitly passed using "call by reference". |
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| ALU | CU |
| ALU (Arithmetic Logical Unit) is a circuit component of CPU that deals with the mathematical calculations, data processing and deducting all the logical conclusions and outputs. | CU (Control Unit) is one of the two main components of the CPU. It deals with the coordination between the hardware devices attached with each either, works as an interactive bridge between software and hardware of the computer system. |
| ALU deals with all the mathematical and logical operations. More than one ALUs can be used for more powerful calculations. The ALU processes the data provided to the CPU as input, and it provides the information as the conclusion of the input in the form of output. | CU deals with the direction of all the tasks and operations performed by CPU. It coordinates and monitor the functionality of components and track the flow of data between the hardware components and the software. |
| ALU deals with the manipulation of the data and works according to the instructions provided by CU. | CU provides the instructions to ALU and coordinates according to the nature of data provided and nature of work to be performed. |
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Shubhi Sharma 7 years ago
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