#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 /*<<< orphan*/ flushall();
int /*<<< orphan*/ getchar();
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, char *);
main() {
  char ch1;
  char ch2;
  printf("Please enter two characters  ");
  scanf("%c", &ch1);
  flushall();
  scanf("%c", &ch2);
  printf("The characters you entered are: \n%c\n%c", ch1, ch2);
  flushall();
  getchar();
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
lea    0xeb1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xee5(%rip),%rdi
lea    -0x1(%rbp),%rsi
call   1060 <scanf@plt>
mov    $0x0,%al
call   1040 <flushall@plt>
lea    0xece(%rip),%rdi
lea    -0x2(%rbp),%rsi
call   1060 <scanf@plt>
movsbl -0x1(%rbp),%esi
movsbl -0x2(%rbp),%edx
lea    0xe92(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    $0x0,%al
call   1040 <flushall@plt>
mov    $0x0,%al
call   1050 <getchar@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
lea    0xeb4(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xee8(%rip),%rbx
lea    0xf(%rsp),%rsi
mov    %rbx,%rdi
call   1060 <scanf@plt>
xor    %eax,%eax
call   1040 <flushall@plt>
lea    0xe(%rsp),%rsi
mov    %rbx,%rdi
call   1060 <scanf@plt>
movsbl 0xf(%rsp),%esi
movsbl 0xe(%rsp),%edx
lea    0xe92(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
call   1040 <flushall@plt>
xor    %eax,%eax
call   1050 <getchar@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [30 x i8] c"Please enter two characters \00"
@.str.1 = [3 x i8] c"%c\00"
@.str.2 = [39 x i8] c"The characters you entered are: \0A%c\0A%c\00"
define i32 @main() {
%1 = alloca i8
%2 = alloca i8
%3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %1)
%5 = call i32 (...) @flushall()
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %2)
%7 = load i8, i8* %1
%8 = sext i8 %7 to i32
%9 = load i8, i8* %2
%10 = sext i8 %9 to i32
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([39 x i8], [39 x i8]* @.str.2, i64 0, i64 0), i32 %8, i32 %10)
%12 = call i32 (...) @flushall()
%13 = call i32 (...) @getchar()
ret i32 0
}

LLVM IR (-O2):
@.str = [30 x i8] c"Please enter two characters \00"
@.str.1 = [3 x i8] c"%c\00"
@.str.2 = [39 x i8] c"The characters you entered are: \0A%c\0A%c\00"
define i32 @main() {
%1 = alloca i8
%2 = alloca i8
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([30 x i8], [30 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %1)
%5 = call i32 (...) @flushall()
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %2)
%7 = load i8, i8* %1
%8 = sext i8 %7 to i32
%9 = load i8, i8* %2
%10 = sext i8 %9 to i32
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([39 x i8], [39 x i8]* @.str.2, i64 0, i64 0), i32 %8, i32 %10)
%12 = call i32 (...) @flushall()
%13 = call i32 (...) @getchar()
ret i32 0
}