#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 *, double *, ...);
int main() {
  double a, b, c, d;
  double score;
  char grade;
  printf("Enter thresholds for A, B, C, D\nin that order, decreasing "
         "percentages > ");
  scanf("%lf%lf%lf%lf", &a, &b, &c, &d);
  printf("Thank you.  Now enter student score (percent) >");
  scanf("%lf", &score);
  if (score >= a)
    grade = 'A';
  else if (score >= b)
    grade = 'B';
  else if (score >= c)
    grade = 'C';
  else if (score >= d)
    grade = 'D';
  else
    grade = 'F';
  printf("Student has an %c grade\n", grade);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xf05(%rip),%rdi
lea    -0x10(%rbp),%rsi
lea    -0x18(%rbp),%rdx
lea    -0x20(%rbp),%rcx
lea    -0x28(%rbp),%r8
mov    $0x0,%al
call   1040 <scanf@plt>
lea    0xef4(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xee2(%rip),%rdi
lea    -0x30(%rbp),%rsi
mov    $0x0,%al
call   1040 <scanf@plt>
movsd  -0x30(%rbp),%xmm0
ucomisd -0x10(%rbp),%xmm0
jb     1194 <main+0x74>
movb   $0x41,-0x31(%rbp)
jmp    11f2 <main+0xd2>
movsd  -0x30(%rbp),%xmm0
ucomisd -0x18(%rbp),%xmm0
jb     11ad <main+0x8d>
movb   $0x42,-0x31(%rbp)
jmp    11ed <main+0xcd>
movsd  -0x30(%rbp),%xmm0
ucomisd -0x20(%rbp),%xmm0
jb     11c6 <main+0xa6>
movb   $0x43,-0x31(%rbp)
jmp    11e8 <main+0xc8>
movsd  -0x30(%rbp),%xmm0
ucomisd -0x28(%rbp),%xmm0
jb     11df <main+0xbf>
movb   $0x44,-0x31(%rbp)
jmp    11e3 <main+0xc3>
movb   $0x46,-0x31(%rbp)
jmp    11e8 <main+0xc8>
jmp    11ed <main+0xcd>
jmp    11f2 <main+0xd2>
movsbl -0x31(%rbp),%esi
lea    0xe89(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x40,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
sub    $0x28,%rsp
lea    0xed5(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xf10(%rip),%rdi
lea    0x20(%rsp),%rsi
lea    0x18(%rsp),%rdx
lea    0x10(%rsp),%rcx
lea    0x8(%rsp),%r8
xor    %eax,%eax
call   1040 <scanf@plt>
lea    0xefb(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xee9(%rip),%rdi
mov    %rsp,%rsi
xor    %eax,%eax
call   1040 <scanf@plt>
movsd  (%rsp),%xmm0
mov    $0x41,%esi
ucomisd 0x20(%rsp),%xmm0
jae    11b0 <main+0x90>
mov    $0x42,%esi
ucomisd 0x18(%rsp),%xmm0
jae    11b0 <main+0x90>
mov    $0x43,%esi
ucomisd 0x10(%rsp),%xmm0
jae    11b0 <main+0x90>
xor    %eax,%eax
ucomisd 0x8(%rsp),%xmm0
setb   %al
lea    (%rax,%rax,1),%esi
add    $0x44,%esi
lea    0xecf(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x28,%rsp
ret

LLVM IR (-O0):
@.str = [73 x i8] c"Enter thresholds for A, B, C, D\0Ain that order, decreasing percentages > \00"
@.str.1 = [13 x i8] c"%lf%lf%lf%lf\00"
@.str.2 = [48 x i8] c"Thank you. Now enter student score (percent) >\00"
@.str.3 = [4 x i8] c"%lf\00"
@.str.4 = [25 x i8] c"Student has an %c grade\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca double
%3 = alloca double
%4 = alloca double
%5 = alloca double
%6 = alloca double
%7 = alloca i8
store i32 0, i32* %1
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([73 x i8], [73 x i8]* @.str, i64 0, i64 0))
%9 = call i32 (i8*, double*, ...) @scanf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0), double* %2, double* %3, double* %4, double* %5)
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([48 x i8], [48 x i8]* @.str.2, i64 0, i64 0))
%11 = call i32 (i8*, double*, ...) @scanf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), double* %6)
%12 = load double, double* %6
%13 = load double, double* %2
%14 = fcmp oge double %12, %13
br i1 %14, label %15, label %16
15: ; preds = %0
store i8 65, i8* %7
br label %35
16: ; preds = %0
%17 = load double, double* %6
%18 = load double, double* %3
%19 = fcmp oge double %17, %18
br i1 %19, label %20, label %21
20: ; preds = %16
store i8 66, i8* %7
br label %34
21: ; preds = %16
%22 = load double, double* %6
%23 = load double, double* %4
%24 = fcmp oge double %22, %23
br i1 %24, label %25, label %26
25: ; preds = %21
store i8 67, i8* %7
br label %33
26: ; preds = %21
%27 = load double, double* %6
%28 = load double, double* %5
%29 = fcmp oge double %27, %28
br i1 %29, label %30, label %31
30: ; preds = %26
store i8 68, i8* %7
br label %32
31: ; preds = %26
store i8 70, i8* %7
br label %32
32: ; preds = %31, %30
br label %33
33: ; preds = %32, %25
br label %34
34: ; preds = %33, %20
br label %35
35: ; preds = %34, %15
%36 = load i8, i8* %7
%37 = sext i8 %36 to i32
%38 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.4, i64 0, i64 0), i32 %37)
ret i32 0
}

LLVM IR (-O2):
@.str = [73 x i8] c"Enter thresholds for A, B, C, D\0Ain that order, decreasing percentages > \00"
@.str.1 = [13 x i8] c"%lf%lf%lf%lf\00"
@.str.2 = [48 x i8] c"Thank you. Now enter student score (percent) >\00"
@.str.3 = [4 x i8] c"%lf\00"
@.str.4 = [25 x i8] c"Student has an %c grade\0A\00"
define i32 @main() {
%1 = alloca double
%2 = alloca double
%3 = alloca double
%4 = alloca double
%5 = alloca double
%6 = bitcast double* %1 to i8*
%7 = bitcast double* %2 to i8*
%8 = bitcast double* %3 to i8*
%9 = bitcast double* %4 to i8*
%10 = bitcast double* %5 to i8*
%11 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([73 x i8], [73 x i8]* @.str, i64 0, i64 0))
%12 = call i32 (i8*, double*, ...) @scanf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0), double* %1, double* %2, double* %3, double* %4)
%13 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([48 x i8], [48 x i8]* @.str.2, i64 0, i64 0))
%14 = call i32 (i8*, double*, ...) @scanf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), double* %5)
%15 = load double, double* %5
%16 = load double, double* %1
%17 = fcmp ult double %15, %16
br i1 %17, label %18, label %28
18: ; preds = %0
%19 = load double, double* %2
%20 = fcmp ult double %15, %19
br i1 %20, label %21, label %28
21: ; preds = %18
%22 = load double, double* %3
%23 = fcmp ult double %15, %22
br i1 %23, label %24, label %28
24: ; preds = %21
%25 = load double, double* %4
%26 = fcmp ult double %15, %25
%27 = select i1 %26, i32 70, i32 68
br label %28
28: ; preds = %24, %21, %18, %0
%29 = phi i32 [ 65, %0 ], [ 66, %18 ], [ 67, %21 ], [ %27, %24 ]
%30 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @.str.4, i64 0, i64 0), i32 %29)
ret i32 0
}