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Understanding Call-By-Value and Call-By-Reference Parameters in Today's Lecture

This lecture covers the two methods of passing arguments as parameters: Call-By-Value and Call-By-Reference. Learn how values and memory addresses are handled, allowing modification of caller's data. Explore the details of what is passed in these parameter types.

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Understanding Call-By-Value and Call-By-Reference Parameters in Today's Lecture

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Presentation Transcript

  1. Today’s Lecture • Parameters • Call-by-value • Call-by-reference

  2. Parameters • Two methods of passing arguments as parameters • Call-by-value • "copy" of value is passed • Call-by-reference • "address of" actual argument is passed

  3. Call-By-Reference Parameters • Used to provide access to caller’sactual argument • Caller’s data can be modified by called function! • Specified by ampersand, &, after type in formal parameter list

  4. Call-By-Reference Details • What’s really passed in? • A "reference" back to memory location of actual argument

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