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global main
 
extern exit
extern printf
extern scanf
 
 
section .text
 
main:
 
 
 
 
 
 
 
 
 
xor edx, edx
push dword a
push dword a1
call scanf
; ost edx
 
 
mov ebx, dword [a]
mov eax, $1
mov ecx, $1
 
        L1:   cmp ecx, ebx        
                je L2           
                imul ecx, eax       
                inc eax         
                jmp L1      
        L2:   
Mov dword [a], eax
 
 
 
 
 
 
 
 
 
push dword [a]
push a2
call printf
 
 
push dword 0
call exit 
ret
 
section .data
 
 
a1 : db "%d",0
a2: db "%d",0xA,0
 
section .bss
a: resd 1
b: resd 1
 

ld: warning: cannot find entry symbol _start; defaulting to 00000000080480a0
prog.o: In function `main':
prog.asm:(.text+0xd): undefined reference to `scanf'
prog.o: In function `L2':
prog.asm:(.text+0x3f): undefined reference to `printf'
prog.asm:(.text+0x49): undefined reference to `exit'

Standard output is empty