a.
Passing parameters by value:
While passing the parameters by value, a copy of that parameter is made and it is passed to the function. The value of parameter is copied to another location of memory. The location of memory where original value is saved remains intact.
Passing parameters by reference:
While passing parameters by reference, the address of value at which it is stored in memory is passed to the function. The original value of parameter changes during execution of a function.
b.
Passing parameters by value:
While passing the parameters by value a copy of that parameter is made and it is passed to the function. The value of parameter is copied to another location of memory. The location of memory where original value is saved remains intact.
Passing parameters by reference:
While passing parameters by reference, the address of value at which it is stored in memory is passed to the function. The original value of parameter changes during execution of a function.
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Computer Science: An Overview (12th Edition)
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