user: 请从给定的汇编指令推导出C源代码：

```asm
<main>:
  endbr64
  push   %r13
  mov    $0xff,%edi
  push   %r12
  push   %rbp
  sub    $0x50,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x48(%rsp)
  xor    %eax,%eax
  lea    0x18(%rsp),%r13
  lea    0x2e(%rsp),%rbp
  call   <sqrt@plt>
  mov    $0x21,%ecx
  mov    $0x21,%edx
  mov    $0xff,%esi
  mov    $0x1,%eax
  movsd  %xmm0,0x8(%rsp)
  lea    0x1c(%rsp),%r12
  lea    D67(%rip),%rdi
  call   <printf@plt>
  movsd  0x8(%rsp),%xmm1
  mov    $0x3f,%ecx
  mov    $0x3f,%edx
  mov    $0xff,%esi
  lea    D7(%rip),%rdi
  mov    $0x1,%eax
  movapd %xmm1,%xmm0
  call   <printf@plt>
  movsd  0x8(%rsp),%xmm1
  mov    $0xff,%esi
  lea    D152(%rip),%rdi
  mov    $0x2,%eax
  movapd %xmm1,%xmm0
  call   <printf@plt>
  mov    $0x1e240,%edi
  call   <sqrt@plt>
  mov    $0x1e240,%esi
  mov    $0x2,%eax
  lea    D184(%rip),%rdi
  movapd %xmm0,%xmm1
  call   <printf@plt>
  mov    $0x5,%edx
  mov    $0x3,%esi
  xor    %eax,%eax
  lea    D175(%rip),%rdi
  call   <printf@plt>
  mov    $0x6f,%eax
  lea    0x22(%rsp),%rsi
  lea    D187(%rip),%rdi
  mov    %ax,0x26(%rsp)
  xor    %eax,%eax
  movl   $0x6c6c6568,0x22(%rsp)
  call   <printf@plt>
  lea    D73(%rip),%rsi
  lea    D2(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    0x20(%rsp),%rsi
  xor    %eax,%eax
  lea    D139(%rip),%rdi
  movb   $0x0,0x20(%rsp)
  call   <printf@plt>
  mov    $0xa,%edi
  call   <putchar@plt>
  mov    $0x6f,%edx
  lea    0x28(%rsp),%rsi
  xor    %eax,%eax
  lea    D22(%rip),%rdi
  mov    %dx,0x2c(%rsp)
  movl   $0x6c6c6568,0x28(%rsp)
  movb   $0x0,0x21(%rsp)
  call   <printf@plt>
  lea    0x21(%rsp),%rsi
  lea    D166(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    $0x3f,%ecx
  movabs $0x3f21216f6c6c6568,%rax
  lea    0x3a(%rsp),%rsi
  mov    %rax,0x3a(%rsp)
  lea    D172(%rip),%rdi
  xor    %eax,%eax
  mov    %cx,0x46(%rsp)
  movl   $0x69682020,0x42(%rsp)
  call   <printf@plt>
  lea    D44(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    %r13,%rsi
  lea    D60(%rip),%rdi
  call   <scanf@plt>
  mov    0x18(%rsp),%esi
  lea    D86(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    %r12,%rcx
  mov    %r13,%rdx
  mov    %rbp,%rdi
  lea    D55(%rip),%rsi
  movl   $0x6b6e75,0x36(%rsp)
  movabs $0x6a2030372e35322d,%rax
  mov    %rax,0x2e(%rsp)
  xor    %eax,%eax
  call   <sscanf@plt>
  mov    0x18(%rsp),%esi
  mov    %rbp,%rdx
  pxor   %xmm0,%xmm0
  lea    D178(%rip),%rdi
  mov    $0x1,%eax
  cvtss2sd 0x1c(%rsp),%xmm0
  call   <printf@plt>
  mov    %rbp,%rdi
  mov    %r12,%rdx
  xor    %eax,%eax
  lea    D50(%rip),%rsi
  call   <sscanf@plt>
  pxor   %xmm0,%xmm0
  mov    %rbp,%rsi
  lea    D164(%rip),%rdi
  mov    $0x1,%eax
  cvtss2sd 0x1c(%rsp),%xmm0
  call   <printf@plt>
  mov    0x48(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L8
  add    $0x50,%rsp
  xor    %eax,%eax
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
L8:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: label: D67
datatype: string
name: unpack_data
arguments: label: D7
datatype: string
name: unpack_data
arguments: label: D152
datatype: string
name: unpack_data
arguments: label: D184
datatype: string
name: unpack_data
arguments: label: D175
datatype: string
name: unpack_data
arguments: label: D187
datatype: string
name: unpack_data
arguments: label: D73
datatype: string
name: unpack_data
arguments: label: D2
datatype: string
name: unpack_data
arguments: label: D139
datatype: string
name: unpack_data
arguments: label: D22
datatype: string
name: unpack_data
arguments: label: D166
datatype: string
name: unpack_data
arguments: label: D172
datatype: string
name: unpack_data
arguments: label: D44
datatype: string
name: unpack_data
arguments: label: D60
datatype: string
name: unpack_data
arguments: label: D86
datatype: string
name: unpack_data
arguments: label: D55
datatype: string
name: unpack_data
arguments: label: D178
datatype: string
name: unpack_data
arguments: label: D50
datatype: string
name: unpack_data
arguments: label: D164
datatype: string

tool: D67: The square root of %d = %f %c%c


tool: D7: The square root of %f = %f %c%c


tool: D152: The square root of %05d = %.3f = %10.4f


tool: D184: The square root of %3d = %.3f = %10.4f


tool: D175: xx: %d, %d


tool: D187: hello: %s


tool: D73: hello

tool: D2: %s again


tool: D139: empty string: [%s]


tool: D22: hello2: %s


tool: D166: Another empty string: <%s>



tool: D172: hello3: %s


tool: D44: Enter an fairly small integer >= 0 (and then return): 

tool: D60: %d

tool: D86: We read in %d



tool: D55: %d%f

tool: D178: Using sscanf %%d%%f, we read in %d and %f from %s


tool: D50: %f

tool: D164: Using sscanf %%f, we read in %f from %s



assistant: ```c
int main() {
  int x = 255;
  double rootx = sqrt(x);
  char bang = '!';
  printf("The square root of %d = %f %c%c\n", x, rootx, bang, bang);
  printf("The square root of %f = %f %c%c\n", x, rootx, '?', '?');
  printf("The square root of %05d = %.3f = %10.4f\n", x, rootx, rootx);
  x = 123456;
  rootx = sqrt(x);
  printf("The square root of %3d = %.3f = %10.4f\n", x, rootx, rootx);
  int xx[2] = {3, 5};
  printf("xx: %d, %d\n", xx[0], xx[1]);
  char hello[6] = {'h', 'e', 'l', 'l', 'o', '\0'};
  printf("hello: %s\n", hello);
  printf("%s again\n", "hello");
  char empty_string[1] = {'\0'};
  printf("empty string: [%s]\n", empty_string);
  printf("\n");
  char hello2[6] = "hello";
  char empty_string2[1] = "";
  printf("hello2: %s\n", hello2);
  printf("Another empty string: <%s>\n\n", empty_string2);
  char hello3[] = "hello!!?  hi?";
  printf("hello3: %s\n", hello3);
  int y;
  printf("Enter an fairly small integer >= 0 (and then return): ");
  scanf("%d", &y);
  printf("We read in %d\n\n", y);
  char buffer[] = "-25.70 junk";
  float h;
  sscanf(buffer, "%d%f", &y, &h);
  printf("Using sscanf %%d%%f, we read in %d and %f from %s\n", y, h, buffer);
  sscanf(buffer, "%f", &h);
  printf("Using sscanf %%f, we read in %f from %s\n\n", h, buffer);
  return 0;
}
```