user: 下面的汇编指令对应的C源代码是什么:

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  lea    D52(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    -0x10(%rbp),%rsi
  lea    -0x14(%rbp),%rcx
  lea    -0x18(%rbp),%rdx
  lea    -0x1c(%rbp),%rax
  mov    %rsi,%r8
  mov    %rax,%rsi
  lea    D39(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  lea    D8(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    -0xc(%rbp),%rax
  mov    %rax,%rsi
  lea    D69(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  movss  -0xc(%rbp),%xmm0
  movss  -0x1c(%rbp),%xmm1
  comiss %xmm1,%xmm0
  jb     L65
  movb   $0x41,-0x1d(%rbp)
  movsbl -0x1d(%rbp),%eax
  mov    %eax,%esi
  lea    D85(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L1
L65:
  movss  -0xc(%rbp),%xmm0
  movss  -0x18(%rbp),%xmm1
  comiss %xmm1,%xmm0
  jb     L27
  movb   $0x42,-0x1d(%rbp)
  movsbl -0x1d(%rbp),%eax
  mov    %eax,%esi
  lea    D85(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L1
L27:
  movss  -0xc(%rbp),%xmm0
  movss  -0x14(%rbp),%xmm1
  comiss %xmm1,%xmm0
  jb     L32
  movb   $0x43,-0x1d(%rbp)
  movsbl -0x1d(%rbp),%eax
  mov    %eax,%esi
  lea    D85(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L1
L32:
  movss  -0xc(%rbp),%xmm0
  movss  -0x10(%rbp),%xmm1
  comiss %xmm1,%xmm0
  jb     L48
  movb   $0x44,-0x1d(%rbp)
  movsbl -0x1d(%rbp),%eax
  mov    %eax,%esi
  lea    D85(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L1
L48:
  movb   $0x46,-0x1d(%rbp)
  lea    D34(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
L1:
  mov    $0x0,%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L24
  call   <__stack_chk_fail@plt>
L24:
  leave
  ret
```

tool_calls: name: unpack_data
arguments: data_label: D52
type_guessed: string
name: unpack_data
arguments: data_label: D39
type_guessed: string
name: unpack_data
arguments: data_label: D8
type_guessed: string
name: unpack_data
arguments: data_label: D69
type_guessed: string
name: unpack_data
arguments: data_label: D85
type_guessed: string
name: unpack_data
arguments: data_label: D34
type_guessed: string

tool: D52: Enter thresholds for A, B, C, D
in that order, decreasing percentages > 

tool: D39: %f %f %f %f

tool: D8: Thank you. Now enter student score (percent) >

tool: D69: %f

tool: D85: Student has an %c grade


tool: D34: Student has failed the course

assistant: ```c
int main() {
  float a;
  float b;
  float c;
  float d;
  float perc;
  char grade;
  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", &perc);
  if (perc >= a) {
    grade = 'A';
    printf("Student has an %c grade\n", grade);
  } else if (perc >= b) {
    grade = 'B';
    printf("Student has an %c grade\n", grade);
  } else if (perc >= c) {
    grade = 'C';
    printf("Student has an %c grade\n", grade);
  } else if (perc >= d) {
    grade = 'D';
    printf("Student has an %c grade\n", grade);
  } else {
    grade = 'F';
    printf("Student has failed the course");
  }
  return 0;
}
```