Question

Please do both questions in MASM and complete these two in two separate files.

3. Summing the Gaps between Array Values

Write a program with an indexed addressing that calculates the sum of all the gaps between successive array elements. The array elements are doublewords, sequenced in nonde- creasing order. So, for example, the array {0, 2, 5, 9, 10} has gaps of 2, 3, 4, and 1, whose sum equals 10.

     4. Copying a Word Array to a DoubleWord array

Write a program that uses a loop to copy all the elements from an unsigned Word (16-bit) array into an unsigned doubleword (32-bit) array.

Answer 1

Write a program with an indexed addressing that calculates the sum of all the gaps between successive array elements. The array elements are doublewords, sequenced in nonde- creasing order. So, for example, the array {0, 2, 5, 9, 10} has gaps of 2, 3, 4, and 1, whose sum equals 10.

.386
.model flat,stdcall
.stack 4096
ExitProcess PROTO, dwExitCode:DWORD

.data
array DWORD 0,2,5,9,10         //initializing the array
result DWORD 0          //initializing the result element
.code
main PROC      // main process starts

mov ECX, LENGTHOF array                             //store the length of array in ECX
mov ESI, OFFSET array                         //this stores the address of the array in ESI

L1:
MOV EAX,[ESI]           //move value of ESI to EAX
MOV EBX,[ESI+4]                    //add 4 to ESI and move the value to EBX
SUB EBX,EAX              //subtracting the value of EAX from EBX and storing the result in EBX
ADD result,EBX           // adding EBX with result and storing the value in result
ADD ESI, TYPE array               // moves pointer to next array element
Loop L1            //loop the whole process

INVOKE ExitProcess,0
main ENDP      //end process
END main         //end of program

Write a program that uses a loop to copy all the elements from an unsigned Word (16-bit) array into an unsigned doubleword (32-bit) array.

.386
.model flat,stdcall
.stack 4096
ExitProcess PROTO, dwExitCode:DWORD

.data
array WORD 0,2,5,9,10             //initializing the array
newArray DWORD LENGTHOF array DUP(?)
.code
main PROC      // main process starts

mov ECX, LENGTHOF array                              //store the length of array in ECX
mov ESI, OFFSET array                         //this stores the address of the array in ESI
mov EDI, OFFSET newArray               //this stores the address of the new array in EDI

L1:
MOV EAX,0                   //move value of 0 to EAX
MOV AX,[ESI]              //move value of ESI to EAX
MOV [EDI], EAX         //move adress of EAX to EDI
ADD ESI, TYPE array               // moves pointer to next array element
ADD EDI, TYPE newArray                     // moves pointer to next newarray element
Loop L1            //loop the whole process

INVOKE ExitProcess,0
main ENDP      //end process
END main         //end of program