#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*/);
int /*<<< orphan*/ scanf(char *, double *, double *);
int /*<<< orphan*/ sqrt(double);
int main() {
  double x1, x2, y1, y2;
  scanf("%lf %lf", &x1, &y1);
  scanf("%lf %lf", &x2, &y2);
  printf("%.4lf\n", sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1)));
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeba(%rip),%rdi
lea    -0x10(%rbp),%rsi
lea    -0x20(%rbp),%rdx
call   1040 <scanf@plt>
lea    0xea6(%rip),%rdi
lea    -0x18(%rbp),%rsi
lea    -0x28(%rbp),%rdx
call   1040 <scanf@plt>
movsd  -0x18(%rbp),%xmm0
subsd  -0x10(%rbp),%xmm0
movsd  -0x18(%rbp),%xmm2
subsd  -0x10(%rbp),%xmm2
movsd  -0x28(%rbp),%xmm1
subsd  -0x20(%rbp),%xmm1
movsd  -0x28(%rbp),%xmm3
subsd  -0x20(%rbp),%xmm3
mulsd  %xmm3,%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
call   1050 <sqrt@plt>
mov    %eax,%esi
lea    0xe5f(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x20,%rsp
lea    0xec4(%rip),%rbx
lea    0x18(%rsp),%rsi
lea    0x8(%rsp),%rdx
mov    %rbx,%rdi
call   1040 <scanf@plt>
lea    0x10(%rsp),%rsi
mov    %rsp,%rdx
mov    %rbx,%rdi
call   1040 <scanf@plt>
movsd  0x10(%rsp),%xmm0
subsd  0x18(%rsp),%xmm0
movsd  (%rsp),%xmm1
subsd  0x8(%rsp),%xmm1
mulsd  %xmm1,%xmm1
mulsd  %xmm0,%xmm0
addsd  %xmm1,%xmm0
call   1050 <sqrt@plt>
lea    0xe7b(%rip),%rdi
mov    %eax,%esi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [8 x i8] c"%lf %lf\00"
@.str.1 = [7 x i8] c"%.4lf\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca double
%3 = alloca double
%4 = alloca double
%5 = alloca double
store i32 0, i32* %1
%6 = call i32 @scanf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), double* %2, double* %4)
%7 = call i32 @scanf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), double* %3, double* %5)
%8 = load double, double* %3
%9 = load double, double* %2
%10 = fsub double %8, %9
%11 = load double, double* %3
%12 = load double, double* %2
%13 = fsub double %11, %12
%14 = load double, double* %5
%15 = load double, double* %4
%16 = fsub double %14, %15
%17 = load double, double* %5
%18 = load double, double* %4
%19 = fsub double %17, %18
%20 = fmul double %16, %19
%21 = call double @llvm.fmuladd.f64(double %10, double %13, double %20)
%22 = call i32 @sqrt(double %21)
%23 = call i32 @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0), i32 %22)
ret i32 0
}

LLVM IR (-O2):
@.str = [8 x i8] c"%lf %lf\00"
@.str.1 = [7 x i8] c"%.4lf\0A\00"
define i32 @main() {
%1 = alloca double
%2 = alloca double
%3 = alloca double
%4 = alloca double
%5 = bitcast double* %1 to i8*
%6 = bitcast double* %2 to i8*
%7 = bitcast double* %3 to i8*
%8 = bitcast double* %4 to i8*
%9 = call i32 @scanf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), double* %1, double* %3)
%10 = call i32 @scanf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), double* %2, double* %4)
%11 = load double, double* %2
%12 = load double, double* %1
%13 = fsub double %11, %12
%14 = load double, double* %4
%15 = load double, double* %3
%16 = fsub double %14, %15
%17 = fmul double %16, %16
%18 = call double @llvm.fmuladd.f64(double %13, double %13, double %17)
%19 = call i32 @sqrt(double %18)
%20 = call i32 @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0), i32 %19)
ret i32 0
}