user: 下面的汇编指令对应的C源代码是什么:

```asm
<main>:
  endbr64
  sub    $0x28,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  lea    D95(%rip),%rdi
  call   <printf@plt>
  lea    D77(%rip),%rdi
  call   <printf@plt>
  lea    0xc(%rsp),%rcx
  lea    0x8(%rsp),%rdx
  lea    0x4(%rsp),%rsi
  lea    0x10(%rsp),%r8
  lea    D70(%rip),%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  lea    D31(%rip),%rdi
  call   <printf@plt>
  lea    0x14(%rsp),%rsi
  lea    D7(%rip),%rdi
  mov    $0x0,%eax
  call   <scanf@plt>
  movss  0x14(%rsp),%xmm0
  movss  0x4(%rsp),%xmm1
  comiss %xmm1,%xmm0
  jae    L40
  movss  0x8(%rsp),%xmm2
  comiss %xmm2,%xmm0
  jb     L114
  comiss %xmm0,%xmm1
  ja     L70
L114:
  movss  0xc(%rsp),%xmm1
  comiss %xmm1,%xmm0
  jb     L44
  comiss %xmm0,%xmm2
  ja     L28
L44:
  comiss 0x10(%rsp),%xmm0
  jb     L91
  comiss %xmm0,%xmm1
  ja     L90
L91:
  lea    D91(%rip),%rdi
  call   <printf@plt>
L50:
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L49
  mov    $0x0,%eax
  add    $0x28,%rsp
  ret
L40:
  lea    D80(%rip),%rdi
  call   <printf@plt>
  jmp    L50
L70:
  lea    D38(%rip),%rdi
  call   <printf@plt>
  jmp    L50
L28:
  lea    D68(%rip),%rdi
  call   <printf@plt>
  jmp    L50
L90:
  lea    D34(%rip),%rdi
  call   <printf@plt>
  jmp    L50
L49:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: extract_symbolic_data
arguments: data_label: D95
type_infered: string
name: extract_symbolic_data
arguments: data_label: D77
type_infered: string
name: extract_symbolic_data
arguments: data_label: D70
type_infered: string
name: extract_symbolic_data
arguments: data_label: D31
type_infered: string
name: extract_symbolic_data
arguments: data_label: D7
type_infered: string
name: extract_symbolic_data
arguments: data_label: D91
type_infered: string
name: extract_symbolic_data
arguments: data_label: D80
type_infered: string
name: extract_symbolic_data
arguments: data_label: D38
type_infered: string
name: extract_symbolic_data
arguments: data_label: D68
type_infered: string
name: extract_symbolic_data
arguments: data_label: D34
type_infered: string

tool: D95: Enter thresholds for A, B, C, D


tool: D77: in that order, decreasing percentages > 

tool: D70: %f %f %f %f

tool: D31: Thank you. Now enter student score (percent) > 

tool: D7: %f

tool: D91: Student has failed the course


tool: D80: Student has an A grade


tool: D38: Student has an B grade


tool: D68: Student has an C grade


tool: D34: Student has an D grade


assistant: ```c
int main() {
  float grade1, grade2, grade3, grade4, score;
  printf("Enter thresholds for A, B, C, D\n");
  printf("in that order, decreasing percentages > ");
  scanf("%f %f %f %f", &grade1, &grade2, &grade3, &grade4);
  printf("Thank you. Now enter student score (percent) > ");
  scanf("%f", &score);
  if (score >= grade1)
    printf("Student has an A grade\n");
  else if (score >= grade2 && score < grade1)
    printf("Student has an B grade\n");
  else if (score >= grade3 && score < grade2)
    printf("Student has an C grade\n");
  else if (score >= grade4 && score < grade3)
    printf("Student has an D grade\n");
  else
    printf("Student has failed the course\n");
  return 0;
}
```