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COM1100 Winter2000 Lecture 7
15
Actual and Formal arguments – pass by reference
nHere actual arguments m,n and formal arguments x, y reference the same data items. nThe significance of this is that the values in the actual arguments (m, n) can now be altered from within Swap by using the formal names (x, y). nx, y do not store copies of the values in m, n, but directly access the locations in memory set aside for these two arguments.