user: 这段汇编代码用C语言表示是什么样的？

```asm
<main>:
  endbr64
  sub    $0x28,%rsp
  lea    D48(%rip),%rdi
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  lea    0xf(%rsp),%rcx
  lea    0xe(%rsp),%rdx
  lea    0x10(%rsp),%rsi
  call   <scanf@plt>
  movzbl 0xe(%rsp),%eax
  cmp    $0x69,%al
  je     L1
  sub    $0x66,%eax
  movzbl 0xf(%rsp),%edx
  cmp    $0x13,%al
  jbe    L287
  cmp    $0x69,%dl
  je     L177
  sub    $0x66,%edx
  xor    %eax,%eax
  cmp    $0x13,%dl
  ja     L177
L343:
  movzbl %dl,%edx
  lea    D20(%rip),%rcx
  mov    (%rcx,%rdx,4),%edx
L252:
  movsd  0x10(%rsp),%xmm0
  cmp    %eax,%edx
  je     L364
  jle    L178
  movsd  D9(%rip),%xmm1
  cmp    $0x1,%eax
  je     L194
  test   %eax,%eax
  je     L364
  cmp    $0x2,%eax
  je     L151
  cmp    $0x3,%eax
  jne    L364
  movsd  D65(%rip),%xmm1
  divsd  %xmm1,%xmm0
  movsd  %xmm0,0x10(%rsp)
  cmp    $0x4,%edx
  je     L364
  mulsd  %xmm1,%xmm0
  movsd  %xmm0,0x10(%rsp)
  cmp    $0x3,%edx
  je     L364
L222:
  movsd  D1(%rip),%xmm1
L329:
  mulsd  %xmm1,%xmm0
  movsd  %xmm0,0x10(%rsp)
  cmp    $0x2,%edx
  je     L364
  jg     L158
L241:
  movsd  D9(%rip),%xmm1
L136:
  mulsd  %xmm1,%xmm0
  movsd  %xmm0,0x10(%rsp)
  cmp    $0x1,%edx
  je     L364
  jg     L194
  nopw   0x0(%rax,%rax,1)
L364:
  lea    D105(%rip),%rdi
  call   <printf@plt>
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L271
  xor    %eax,%eax
  add    $0x28,%rsp
  ret
L287:
  movzbl %al,%eax
  lea    D20(%rip),%rcx
  mov    (%rcx,%rax,4),%eax
  cmp    $0x69,%dl
  je     L105
  sub    $0x66,%edx
  cmp    $0x13,%dl
  jbe    L343
  test   %eax,%eax
  je     L177
  cmp    $0x4,%eax
  je     L186
L189:
  movsd  0x10(%rsp),%xmm0
  xor    %edx,%edx
  jmp    L333
  nopl   0x0(%rax)
L194:
  divsd  %xmm1,%xmm0
  movsd  %xmm0,0x10(%rsp)
  cmp    $0x2,%edx
  je     L364
  jle    L136
L151:
  movsd  D1(%rip),%xmm1
L158:
  divsd  %xmm1,%xmm0
  movsd  %xmm0,0x10(%rsp)
  cmp    $0x3,%edx
  je     L364
  cmp    $0x4,%edx
  jne    L329
L123:
  divsd  D65(%rip),%xmm0
  movsd  %xmm0,0x10(%rsp)
  jmp    L364
L178:
  cmp    $0x4,%eax
  je     L295
L333:
  cmp    $0x2,%eax
  je     L241
  cmp    $0x3,%eax
  jne    L364
  jmp    L222
L295:
  mulsd  D65(%rip),%xmm0
  movsd  %xmm0,0x10(%rsp)
  cmp    $0x3,%edx
  je     L364
  cmp    $0x4,%edx
  je     L123
  jmp    L222
L1:
  movzbl 0xf(%rsp),%edx
  cmp    $0x69,%dl
  je     L177
  sub    $0x66,%edx
  mov    $0x1,%eax
  cmp    $0x13,%dl
  jbe    L343
  jmp    L189
L177:
  movsd  0x10(%rsp),%xmm0
  jmp    L364
L186:
  movsd  D65(%rip),%xmm0
  movsd  D1(%rip),%xmm1
  xor    %edx,%edx
  mulsd  0x10(%rsp),%xmm0
  jmp    L329
L105:
  mov    $0x1,%edx
  jmp    L252
L271:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: data_label: D48
type: string
name: read_data
arguments: data_label: D20
type: string
name: read_data
arguments: data_label: D9
type: byte[8]
name: read_data
arguments: data_label: D65
type: byte[8]
name: read_data
arguments: data_label: D1
type: byte[8]
name: read_data
arguments: data_label: D105
type: string

tool: D48: %lf %c %c

tool: D20: 

tool: {"D9": [0x00,0x00,0x00,0x00,0x00,0x00,0x28,0x40]}

tool: {"D65": [0x00,0x00,0x00,0x00,0x00,0x80,0x9b,0x40]}

tool: {"D1": [0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x40]}

tool: D105: %.6lf


assistant: ```c
int main(void) {
  double amount;
  char fromUnit, toUnit;
  int from = 0, to = 0;
  scanf("%lf %c %c", &amount, &fromUnit, &toUnit);
  if (fromUnit == 'i')
    from = 1;
  else if (fromUnit == 'f')
    from = 2;
  else if (fromUnit == 'y')
    from = 3;
  else if (fromUnit == 'm')
    from = 4;
  else
    from = 0;
  if (toUnit == 'i')
    to = 1;
  else if (toUnit == 'f')
    to = 2;
  else if (toUnit == 'y')
    to = 3;
  else if (toUnit == 'm')
    to = 4;
  else
    to = 0;
  while (1) {
    if (from == to) {
      printf("%.6lf\n", amount);
      return 0;
    }
    if (to > from) {
      switch (from) {
      case 1:
        amount /= 12;
        from++;
        break;
      case 2:
        amount /= 3;
        from++;
        break;
      case 3:
        amount /= 1760;
        from++;
        break;
      default:
        from = to;
        break;
      }
    } else {
      switch (from) {
      case 4:
        amount *= 1760;
        from--;
        break;
      case 3:
        amount *= 3;
        from--;
        break;
      case 2:
        amount *= 12;
        from--;
        break;
      default:
        from = to;
        break;
      }
    }
  }
}
```