#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*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, char *);
int main() {
  char ch;
  printf("please input a char:\n");
  scanf("%c", &ch);
  if (ch > 64 && ch < 91)
    printf("char(%c) is an uppercase char.", ch);
  else
    printf("char(%c) is NOT an uppercase char.", ch);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xed2(%rip),%rdi
lea    -0x5(%rbp),%rsi
call   1040 <scanf@plt>
movsbl -0x5(%rbp),%eax
cmp    $0x40,%eax
jle    117e <main+0x5e>
movsbl -0x5(%rbp),%eax
cmp    $0x5b,%eax
jge    117e <main+0x5e>
movsbl -0x5(%rbp),%esi
lea    0xea7(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    1190 <main+0x70>
movsbl -0x5(%rbp),%esi
lea    0xeaf(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xf0d(%rip),%rdi
call   1030 <puts@plt>
lea    0xebc(%rip),%rdi
lea    0x7(%rsp),%rsi
call   1050 <scanf@plt>
movsbl 0x7(%rsp),%esi
lea    -0x41(%rsi),%eax
cmp    $0x1a,%al
lea    0xea4(%rip),%rax
lea    0xebc(%rip),%rdi
cmovb  %rax,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [22 x i8] c"please input a char:\0A\00"
@.str.1 = [3 x i8] c"%c\00"
@.str.2 = [31 x i8] c"char(%c) is an uppercase char.\00"
@.str.3 = [35 x i8] c"char(%c) is NOT an uppercase char.\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i8
store i32 0, i32* %1
%3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([22 x i8], [22 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* %2)
%5 = load i8, i8* %2
%6 = sext i8 %5 to i32
%7 = icmp sgt i32 %6, 64
br i1 %7, label %8, label %16
8: ; preds = %0
%9 = load i8, i8* %2
%10 = sext i8 %9 to i32
%11 = icmp slt i32 %10, 91
br i1 %11, label %12, label %16
12: ; preds = %8
%13 = load i8, i8* %2
%14 = sext i8 %13 to i32
%15 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.2, i64 0, i64 0), i32 %14)
br label %20
16: ; preds = %8, %0
%17 = load i8, i8* %2
%18 = sext i8 %17 to i32
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([35 x i8], [35 x i8]* @.str.3, i64 0, i64 0), i32 %18)
br label %20
20: ; preds = %16, %12
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [3 x i8] c"%c\00"
@.str.2 = [31 x i8] c"char(%c) is an uppercase char.\00"
@.str.3 = [35 x i8] c"char(%c) is NOT an uppercase char.\00"
@str = [21 x i8] c"please input a char:\00"
define i32 @main() {
%1 = alloca i8
%2 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([21 x i8], [21 x i8]* @str, i64 0, i64 0))
%3 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %1)
%4 = load i8, i8* %1
%5 = sext i8 %4 to i32
%6 = add i8 %4, -65
%7 = icmp ult i8 %6, 26
%8 = select i1 %7, i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([35 x i8], [35 x i8]* @.str.3, i64 0, i64 0)
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) %8, i32 %5)
ret i32 0
}