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


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xf05(%rip),%rdi
lea    -0x8(%rbp),%rsi
lea    -0xc(%rbp),%rdx
lea    -0x10(%rbp),%rcx
lea    -0x14(%rbp),%r8
mov    $0x0,%al
call   1040 <scanf@plt>
lea    0xef0(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xedf(%rip),%rdi
lea    -0x18(%rbp),%rsi
mov    $0x0,%al
call   1040 <scanf@plt>
movss  -0x18(%rbp),%xmm1
movss  -0x14(%rbp),%xmm0
ucomiss %xmm1,%xmm0
jbe    11a1 <main+0x81>
lea    0xeec(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    11e7 <main+0xc7>
movss  -0x18(%rbp),%xmm1
movss  -0x10(%rbp),%xmm0
ucomiss %xmm1,%xmm0
jbe    11bd <main+0x9d>
movb   $0x43,-0x19(%rbp)
jmp    11e2 <main+0xc2>
movss  -0x18(%rbp),%xmm1
movss  -0xc(%rbp),%xmm0
ucomiss %xmm1,%xmm0
jbe    11d9 <main+0xb9>
movb   $0x42,-0x19(%rbp)
jmp    11dd <main+0xbd>
movb   $0x41,-0x19(%rbp)
jmp    11e2 <main+0xc2>
jmp    11e7 <main+0xc7>
movsbl -0x19(%rbp),%eax
cmp    $0x41,%eax
je     120e <main+0xee>
movsbl -0x19(%rbp),%eax
cmp    $0x42,%eax
je     120e <main+0xee>
movsbl -0x19(%rbp),%eax
cmp    $0x43,%eax
jne    1220 <main+0x100>
movsbl -0x19(%rbp),%esi
lea    0xe87(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
sub    $0x18,%rsp
lea    0xec5(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xf00(%rip),%rdi
lea    0x14(%rsp),%rsi
lea    0x10(%rsp),%rdx
lea    0xc(%rsp),%rcx
lea    0x8(%rsp),%r8
xor    %eax,%eax
call   1050 <scanf@plt>
lea    0xee7(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xed6(%rip),%rdi
lea    0x4(%rsp),%rsi
xor    %eax,%eax
call   1050 <scanf@plt>
movss  0x4(%rsp),%xmm0
movss  0x8(%rsp),%xmm1
ucomiss %xmm0,%xmm1
jbe    11a4 <main+0x74>
lea    0xefd(%rip),%rdi
call   1030 <puts@plt>
jmp    11d4 <main+0xa4>
movss  0x10(%rsp),%xmm1
xor    %eax,%eax
ucomiss %xmm0,%xmm1
seta   %al
movss  0xc(%rsp),%xmm1
add    $0x41,%eax
ucomiss %xmm0,%xmm1
mov    $0x43,%esi
cmovbe %eax,%esi
lea    0xeb4(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x18,%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 = [9 x i8] c"%f%f%f%f\00"
@.str.2 = [47 x i8] c"Thank you. Now enter student score (percent) >\00"
@.str.3 = [3 x i8] c"%f\00"
@.str.4 = [31 x i8] c"Student has failed the course\0A\00"
@.str.5 = [25 x i8] c"Student has an %c grade\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca float
%3 = alloca float
%4 = alloca float
%5 = alloca float
%6 = alloca float
%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*, float*, ...) @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), float* %2, float* %3, float* %4, float* %5)
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([47 x i8], [47 x i8]* @.str.2, i64 0, i64 0))
%11 = call i32 (i8*, float*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0), float* %6)
%12 = load float, float* %6
%13 = load float, float* %5
%14 = fcmp olt float %12, %13
br i1 %14, label %15, label %17
15: ; preds = %0
%16 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.4, i64 0, i64 0))
br label %30
17: ; preds = %0
%18 = load float, float* %6
%19 = load float, float* %4
%20 = fcmp olt float %18, %19
br i1 %20, label %21, label %22
21: ; preds = %17
store i8 67, i8* %7
br label %29
22: ; preds = %17
%23 = load float, float* %6
%24 = load float, float* %3
%25 = fcmp olt float %23, %24
br i1 %25, label %26, label %27
26: ; preds = %22
store i8 66, i8* %7
br label %28
27: ; preds = %22
store i8 65, i8* %7
br label %28
28: ; preds = %27, %26
br label %29
29: ; preds = %28, %21
br label %30
30: ; preds = %29, %15
%31 = load i8, i8* %7
%32 = sext i8 %31 to i32
%33 = icmp eq i32 %32, 65
br i1 %33, label %42, label %34
34: ; preds = %30
%35 = load i8, i8* %7
%36 = sext i8 %35 to i32
%37 = icmp eq i32 %36, 66
br i1 %37, label %42, label %38
38: ; preds = %34
%39 = load i8, i8* %7
%40 = sext i8 %39 to i32
%41 = icmp eq i32 %40, 67
br i1 %41, label %42, label %46
42: ; preds = %38, %34, %30
%43 = load i8, i8* %7
%44 = sext i8 %43 to i32
%45 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.5, i64 0, i64 0), i32 %44)
br label %46
46: ; preds = %42, %38
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 = [9 x i8] c"%f%f%f%f\00"
@.str.2 = [47 x i8] c"Thank you. Now enter student score (percent) >\00"
@.str.3 = [3 x i8] c"%f\00"
@.str.5 = [25 x i8] c"Student has an %c grade\0A\00"
@str = [30 x i8] c"Student has failed the course\00"
define i32 @main() {
%1 = alloca float
%2 = alloca float
%3 = alloca float
%4 = alloca float
%5 = alloca float
%6 = bitcast float* %1 to i8*
%7 = bitcast float* %2 to i8*
%8 = bitcast float* %3 to i8*
%9 = bitcast float* %4 to i8*
%10 = bitcast float* %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*, float*, ...) @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), float* %1, float* %2, float* %3, float* %4)
%13 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([47 x i8], [47 x i8]* @.str.2, i64 0, i64 0))
%14 = call i32 (i8*, float*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0), float* %5)
%15 = load float, float* %5
%16 = load float, float* %4
%17 = fcmp olt float %15, %16
br i1 %17, label %18, label %20
18: ; preds = %0
%19 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([30 x i8], [30 x i8]* @str, i64 0, i64 0))
br label %28
20: ; preds = %0
%21 = load float, float* %3
%22 = fcmp olt float %15, %21
%23 = load float, float* %2
%24 = fcmp olt float %15, %23
%25 = select i1 %24, i32 66, i32 65
%26 = select i1 %22, i32 67, i32 %25
%27 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @.str.5, i64 0, i64 0), i32 %26)
br label %28
28: ; preds = %18, %20
ret i32 0
}