Microprocessor
Assertion (A): Negative values of incremental operator in DO loop are allowed in Fortran 77 but not in earlier versions of Fortran. Reason (R): Fortran 77 has better array facilities than earlier versions of Fortran.

Both A and R are correct but R is not correct explanation of A
A is correct R is wrong
A is wrong R is correct
Both A and R are correct and R is correct explanation of A

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Microprocessor
The stack pointer register in a microprocessor

 counts the number of programs being executing on the microprocessor
 counts the number of instructions being executing on the microprocessor
 holds the address of the top of the stack
 keeps the address of the next instruction to be fetched

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