#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int EXIT_SUCCESS;
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, char *);
int main() {
  char number[20];
  char rubbish[0x100];
  printf("Hexadecimal:\n");
  scanf(" %[0-9a-fA-F]", number);
  scanf(" %[\n]", rubbish);
  printf("%s\n", number);
  printf("%s\n", rubbish);
  return EXIT_SUCCESS;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x120,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xec7(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x20(%rbp),%rsi
lea    0xec3(%rip),%rdi
call   1040 <scanf@plt>
lea    -0x120(%rbp),%rsi
lea    0xebe(%rip),%rdi
call   1040 <scanf@plt>
lea    -0x20(%rbp),%rsi
lea    0xeb4(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x120(%rbp),%rsi
lea    0xe9f(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    0x2e4f(%rip),%rax
mov    (%rax),%eax
add    $0x120,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
sub    $0x128,%rsp
lea    0xee3(%rip),%rdi
call   1030 <puts@plt>
lea    0xec3(%rip),%rdi
mov    %rsp,%r14
mov    %r14,%rsi
call   1040 <scanf@plt>
lea    0xebf(%rip),%rdi
lea    0x20(%rsp),%rbx
mov    %rbx,%rsi
call   1040 <scanf@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
call   1030 <puts@plt>
mov    0x2e6d(%rip),%rax
mov    (%rax),%eax
add    $0x128,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [14 x i8] c"Hexadecimal:\0A\00"
@.str.1 = [14 x i8] c" %[0-9a-fA-F]\00"
@.str.2 = [6 x i8] c" %[\0A]\00"
@.str.3 = [4 x i8] c"%s\0A\00"
@EXIT_SUCCESS = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca [20 x i8]
%3 = alloca [256 x i8]
store i32 0, i32* %1
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str, i64 0, i64 0))
%5 = getelementptr inbounds [20 x i8], [20 x i8]* %2, i64 0, i64 0
%6 = call i32 @scanf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i8* %5)
%7 = getelementptr inbounds [256 x i8], [256 x i8]* %3, i64 0, i64 0
%8 = call i32 @scanf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0), i8* %7)
%9 = getelementptr inbounds [20 x i8], [20 x i8]* %2, i64 0, i64 0
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i8* %9)
%11 = getelementptr inbounds [256 x i8], [256 x i8]* %3, i64 0, i64 0
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i8* %11)
%13 = load i32, i32* @EXIT_SUCCESS
ret i32 %13
}

LLVM IR (-O2):
@.str.1 = [14 x i8] c" %[0-9a-fA-F]\00"
@.str.2 = [6 x i8] c" %[\0A]\00"
@EXIT_SUCCESS = global i32 0
@str = [13 x i8] c"Hexadecimal:\00"
define i32 @main() {
%1 = alloca [20 x i8]
%2 = alloca [256 x i8]
%3 = getelementptr inbounds [20 x i8], [20 x i8]* %1, i64 0, i64 0
%4 = getelementptr inbounds [256 x i8], [256 x i8]* %2, i64 0, i64 0
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @str, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i8* %3)
%7 = call i32 @scanf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0), i8* %4)
%8 = call i32 @puts(i8* %3)
%9 = call i32 @puts(i8* %4)
%10 = load i32, i32* @EXIT_SUCCESS
ret i32 %10
}