Integer arithmetic operations in x86 MASM cleaned up

.586
.MODEL FLAT, C

.DATA
order1Switch DB 0 ;Set to 0 if addition, 1 if subtraction
a DWORD 5
b DWORD 2

.CODE

MAINNEW PROC
    mov ecx, 0 ;Set ECX to 0 for counter

    ; Initalize data register (EAX, accumulator) with first value
    mov eax, 0
    add eax, a

    cmp order1Switch, 0
    je execAdd
    jmp execSub

    execAdd:
        call ADDITION
        jmp endSect

    execSub:
        call SUBTRACTION
        jmp endSect

    execMulti:
        call MULTIPLICATION
        jmp endSect

    endSect:
        mov eax, eax
MAINNEW ENDP

ADDITION PROC
    add eax, b
    ret
ADDITION ENDP

SUBTRACTION PROC
    sub eax, b
    ret
SUBTRACTION ENDP

MULTIPLICATION PROC
    mov ecx, b
    multiply:
        add eax, a
        loop multiply
    ret
MULTIPLICATION ENDP

DIVISION PROC

DIVISION ENDP

END