You opened a batch file in Notepad and are observing the following lines. (The line numbers are for reference only.)
1- ECHO This batch file deletes the temp files
2- DEL %TEMP%\*.* /Q
3- REM The temp files were deleted
4- PAUSE
Which of the lines is a comment?
A. Line 1
B. Line 2
C. Line 3
D. Line 4
E. There are no comments in this file.
Answer: C
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A RISC processor implements a subroutine call using a link register (i.e., the return address is saved in the link register).The cost of a call is 2 cycles and the return costs 1 cycle. If a subroutine is called from another subroutine (i.e., the subroutine is nested), the contents of the link register must be saved and later restored. The cost of saving the link register is 6 cycles and the cost of restoring the link register is 8 cycles. Assume that a certain instruction mix contains 20% subroutine calls and returns (i.e., 10% calls, 10% returns). The probability of a single subroutine call and return without nesting is 60%. The probability that a subroutine call will be followed by a single nested call is 40%. Assume that the probability of further nesting is vanishingly small. What is
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