Question

write a Program that converts uppercase character to lower case letter character.

Declare function

char toLower( char ch);

to do the conversion.if ch is not an uppercase character the function should return ch unchanged.

if it is an uppercase character ,add the difference of 'a' and 'A' to ch as the return value.

Write your program with a global variable for the actual parameter.

Translate to Pep/9 assembly language. Pep/9 assembly language Only please

Answer 1

main:
        push    rbp
        mov     rbp, rsp
        sub     rsp, 16
        nop
        call    getchar
        mov     DWORD PTR [rbp-4], eax
        cmp     DWORD PTR [rbp-4], -1
        je      .L3
        mov     eax, DWORD PTR [rbp-4]
        mov     edi, eax
        call    chartolower
        mov     edi, eax
        call    putchar
        nop
.L3:
        mov     eax, 0
        leave
        ret
chartolower:
        push    rbp
        mov     rbp, rsp
        mov     DWORD PTR [rbp-4], edi
        cmp     DWORD PTR [rbp-4], 64
        jle     .L7
        cmp     DWORD PTR [rbp-4], 90
        jg      .L7
        mov     eax, DWORD PTR [rbp-4]
        add     eax, 32
        jmp     .L9
.L7:
        mov     eax, DWORD PTR [rbp-4]
.L9:
        pop     rbp
        ret