#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) || (ch > 96 && ch < 123))
    printf("Yes,it's a char.\n");
  else
    printf("No,it's NOT  a char.");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
call   1030 <printf@plt>
lea    0xed3(%rip),%rdi
lea    -0x5(%rbp),%rsi
call   1040 <scanf@plt>
movsbl -0x5(%rbp),%eax
cmp    $0x40,%eax
jle    1165 <main+0x45>
movsbl -0x5(%rbp),%eax
cmp    $0x5b,%eax
jl     117f <main+0x5f>
movsbl -0x5(%rbp),%eax
cmp    $0x60,%eax
jle    1190 <main+0x70>
movsbl -0x5(%rbp),%eax
cmp    $0x7b,%eax
jge    1190 <main+0x70>
lea    0xe92(%rip),%rdi
call   1030 <printf@plt>
jmp    119c <main+0x7c>
lea    0xe93(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xee0(%rip),%rdi
call   1030 <puts@plt>
lea    0xebc(%rip),%rdi
lea    0x7(%rsp),%rsi
call   1050 <scanf@plt>
mov    0x7(%rsp),%al
and    $0xdf,%al
add    $0xbf,%al
cmp    $0x19,%al
ja     1168 <main+0x38>
lea    0xecb(%rip),%rdi
call   1030 <puts@plt>
jmp    1174 <main+0x44>
lea    0xe94(%rip),%rdi
call   1040 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [21 x i8] c"please input a char\0A\00"
@.str.1 = [3 x i8] c"%c\00"
@.str.2 = [18 x i8] c"Yes,it's a char.\0A\00"
@.str.3 = [21 x i8] c"No,it's NOT a char.\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i8
store i32 0, i32* %1
%3 = call i32 @printf(i8* getelementptr inbounds ([21 x i8], [21 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 %12
8: ; preds = %0
%9 = load i8, i8* %2
%10 = sext i8 %9 to i32
%11 = icmp slt i32 %10, 91
br i1 %11, label %20, label %12
12: ; preds = %8, %0
%13 = load i8, i8* %2
%14 = sext i8 %13 to i32
%15 = icmp sgt i32 %14, 96
br i1 %15, label %16, label %22
16: ; preds = %12
%17 = load i8, i8* %2
%18 = sext i8 %17 to i32
%19 = icmp slt i32 %18, 123
br i1 %19, label %20, label %22
20: ; preds = %16, %8
%21 = call i32 @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.2, i64 0, i64 0))
br label %24
22: ; preds = %16, %12
%23 = call i32 @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.3, i64 0, i64 0))
br label %24
24: ; preds = %22, %20
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [3 x i8] c"%c\00"
@.str.3 = [21 x i8] c"No,it's NOT a char.\00"
@str = [20 x i8] c"please input a char\00"
@str.4 = [17 x i8] c"Yes,it's a char.\00"
define i32 @main() {
%1 = alloca i8
%2 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([20 x i8], [20 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 = and i8 %4, -33
%6 = add i8 %5, -65
%7 = icmp ult i8 %6, 26
br i1 %7, label %8, label %10
8: ; preds = %0
%9 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @str.4, i64 0, i64 0))
br label %12
10: ; preds = %0
%11 = call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([21 x i8], [21 x i8]* @.str.3, i64 0, i64 0))
br label %12
12: ; preds = %10, %8
ret i32 0
}