Question

True or false Assembly x86

41. _____ The program counter is a pointer to the instruction.

42. _____ Program labels aren’t necessary to assembled code because the offsets are part of

the instruction,

43. _____ Re-entrant code is code that more than one task uses.

44. _____ A diamond-shaped area in a flowchart means it is a decision point.

45. _____ If using AND or OR, for example, the two operands must be the same size.

46. _____ Each assembly language instruction corresponds to several machine language

instructions.

Answer 1

41) True

PC or program counter is a register in a computer processor which contain the location or address of the instruction being executed at a time. As each instruction get fetched, the PC is incremented by one. After each instruction is fetched the PC points to the next instruction in the sequence.

42) False

Labels and offsets do different functions.

Labels are symbolic representation of addresses. It is used to mark specific addresses that is needed to refer from other parts of the code.

Offsets usually denotes the number of address location added to the base address in order to get a specific absolute address. It is the address from the beginning of the memory segment where the variable is stored. The offset operator returns the offset of a memory location.

43) True

Re-entrant code is a computer program or routine that is written in a way so that the same copy in the memory can be shared by multiple users. It is written by making sure that no instructions modify the contents of the variable value in other instructions within the program.

44) True

A diamond shaped symbol is used as a decision or branching point in a flowchart. Lines representing different decisions emerge from different point of the Diamond

45) True

You can't AND or OR different bit lengths. The operands must be of same size while doing AND or OR operations

46) False

Assembly language uses Mnemonics, for example for a machine instruction 110001011 , the assembly instruction is ADD. An assembly language instruction corresponds to one machine language instructions. While one high level language instruction corresponds to more than one machine language instructions.

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