#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 *, int *, ...);
int main(void) {
  int n, x, y;
  scanf("%d\n", &n);
  while (n-- > 0) {
    scanf("%d %d\n", &x, &y);
    if (y == 0) {
      printf("divisao impossivel\n");
    } else {
      printf("%.1f\n", (double)x / y);
    }
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xecd(%rip),%rdi
lea    -0x8(%rbp),%rsi
mov    $0x0,%al
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
mov    %eax,%ecx
add    $0xffffffff,%ecx
mov    %ecx,-0x8(%rbp)
cmp    $0x0,%eax
jle    11a9 <main+0x89>
lea    0xea4(%rip),%rdi
lea    -0xc(%rbp),%rsi
lea    -0x10(%rbp),%rdx
mov    $0x0,%al
call   1040 <scanf@plt>
cmpl   $0x0,-0x10(%rbp)
jne    1188 <main+0x68>
lea    0xe8b(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    11a4 <main+0x84>
cvtsi2sdl -0xc(%rbp),%xmm0
cvtsi2sdl -0x10(%rbp),%xmm1
divsd  %xmm1,%xmm0
lea    0xe7e(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
jmp    1141 <main+0x21>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x10,%rsp
lea    0xebf(%rip),%rdi
lea    0x4(%rsp),%rsi
xor    %eax,%eax
call   1050 <scanf@plt>
mov    0x4(%rsp),%eax
lea    -0x1(%rax),%ecx
mov    %ecx,0x4(%rsp)
test   %eax,%eax
jle    11cf <main+0x9f>
lea    0xe9a(%rip),%r14
lea    0xc(%rsp),%r15
lea    0x8(%rsp),%rbx
lea    0xe96(%rip),%r12
lea    0xe89(%rip),%r13
jmp    11ad <main+0x7d>
xorps  %xmm0,%xmm0
cvtsi2sdl 0xc(%rsp),%xmm0
xorps  %xmm1,%xmm1
cvtsi2sd %eax,%xmm1
divsd  %xmm1,%xmm0
mov    %r13,%rdi
mov    $0x1,%al
call   1040 <printf@plt>
mov    0x4(%rsp),%eax
lea    -0x1(%rax),%ecx
mov    %ecx,0x4(%rsp)
test   %eax,%eax
jle    11cf <main+0x9f>
mov    %r14,%rdi
mov    %r15,%rsi
mov    %rbx,%rdx
xor    %eax,%eax
call   1050 <scanf@plt>
mov    0x8(%rsp),%eax
test   %eax,%eax
jne    1180 <main+0x50>
mov    %r12,%rdi
call   1030 <puts@plt>
jmp    119e <main+0x6e>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [4 x i8] c"%d\0A\00"
@.str.1 = [7 x i8] c"%d %d\0A\00"
@.str.2 = [20 x i8] c"divisao impossivel\0A\00"
@.str.3 = [6 x i8] c"%.1f\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
store i32 0, i32* %1
%5 = call i32 (i8*, i32*, ...) @scanf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32* %2)
br label %6
6: ; preds = %23, %0
%7 = load i32, i32* %2
%8 = add nsw i32 %7, -1
store i32 %8, i32* %2
%9 = icmp sgt i32 %7, 0
br i1 %9, label %10, label %24
10: ; preds = %6
%11 = call i32 (i8*, i32*, ...) @scanf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0), i32* %3, i32* %4)
%12 = load i32, i32* %4
%13 = icmp eq i32 %12, 0
br i1 %13, label %14, label %16
14: ; preds = %10
%15 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.2, i64 0, i64 0))
br label %23
16: ; preds = %10
%17 = load i32, i32* %3
%18 = sitofp i32 %17 to double
%19 = load i32, i32* %4
%20 = sitofp i32 %19 to double
%21 = fdiv double %18, %20
%22 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0), double %21)
br label %23
23: ; preds = %16, %14
br label %6
24: ; preds = %6
ret i32 0
}

LLVM IR (-O2):
@.str = [4 x i8] c"%d\0A\00"
@.str.1 = [7 x i8] c"%d %d\0A\00"
@.str.3 = [6 x i8] c"%.1f\0A\00"
@str = [19 x i8] c"divisao impossivel\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = bitcast i32* %1 to i8*
%5 = bitcast i32* %2 to i8*
%6 = bitcast i32* %3 to i8*
%7 = call i32 (i8*, i32*, ...) @scanf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32* %1)
%8 = load i32, i32* %1
%9 = add nsw i32 %8, -1
store i32 %9, i32* %1
%10 = icmp sgt i32 %8, 0
br i1 %10, label %11, label %27
11: ; preds = %0, %23
%12 = call i32 (i8*, i32*, ...) @scanf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0), i32* %2, i32* %3)
%13 = load i32, i32* %3
%14 = icmp eq i32 %13, 0
br i1 %14, label %15, label %17
15: ; preds = %11
%16 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @str, i64 0, i64 0))
br label %23
17: ; preds = %11
%18 = load i32, i32* %2
%19 = sitofp i32 %18 to double
%20 = sitofp i32 %13 to double
%21 = fdiv double %19, %20
%22 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0), double %21)
br label %23
23: ; preds = %17, %15
%24 = load i32, i32* %1
%25 = add nsw i32 %24, -1
store i32 %25, i32* %1
%26 = icmp sgt i32 %24, 0
br i1 %26, label %11, label %27
27: ; preds = %23, %0
ret i32 0
}