Language: C++

#include <iostream>
#include <cmath>
using namespace std;
&#160;
int main()
{
&#160;&#160;&#160;&#160;double x1, y1, x2, y2;
&#160;&#160;&#160;&#160;cin >> x1 >> y1 >> x2 >> y2;
&#160;
&#160;&#160;&#160;&#160;cout.precision(8);
&#160;&#160;&#160;&#160;cout << fixed << sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)) << endl;
&#160;
&#160;&#160;&#160;&#160;return 0;
}

Compiler output:
a.cc:4:2: error: stray '#' in program
    4 | &#160;
      |  ^
a.cc:7:2: error: stray '#' in program
    7 | &#160;&#160;&#160;&#160;double x1, y1, x2, y2;
      |  ^
a.cc:7:8: error: stray '#' in program
    7 | &#160;&#160;&#160;&#160;double x1, y1, x2, y2;
      |        ^
a.cc:7:14: error: stray '#' in program
    7 | &#160;&#160;&#160;&#160;double x1, y1, x2, y2;
      |              ^
a.cc:7:20: error: stray '#' in program
    7 | &#160;&#160;&#160;&#160;double x1, y1, x2, y2;
      |                    ^
a.cc:8:2: error: stray '#' in program
    8 | &#160;&#160;&#160;&#160;cin >> x1 >> y1 >> x2 >> y2;
      |  ^
a.cc:8:8: error: stray '#' in program
    8 | &#160;&#160;&#160;&#160;cin >> x1 >> y1 >> x2 >> y2;
      |        ^
a.cc:8:14: error: stray '#' in program
    8 | &#160;&#160;&#160;&#160;cin >> x1 >> y1 >> x2 >> y2;
      |              ^
a.cc:8:20: error: stray '#' in program
    8 | &#160;&#160;&#160;&#160;cin >> x1 >> y1 >> x2 >> y2;
      |                    ^
a.cc:9:2: error: stray '#' in program
    9 | &#160;
      |  ^
a.cc:10:2: error: stray '#' in program
   10 | &#160;&#160;&#160;&#160;cout.precision(8);
      |  ^
a.cc:10:8: error: stray '#' in program
   10 | &#160;&#160;&#160;&#160;cout.precision(8);
      |        ^
a.cc:10:14: error: stray '#' in program
   10 | &#160;&#160;&#160;&#160;cout.precision(8);
      |              ^
a.cc:10:20: error: stray '#' in program
   10 | &#160;&#160;&#160;&#160;cout.precision(8);
      |                    ^
a.cc:11:2: error: stray '#' in program
   11 | &#160;&#160;&#160;&#160;cout << fixed << sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)) << endl;
      |  ^
a.cc:11:8: error: stray '#' in program
   11 | &#160;&#160;&#160;&#160;cout << fixed << sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)) << endl;
      |        ^
a.cc:11:14: error: stray '#' in program
   11 | &#160;&#160;&#160;&#160;cout << fixed << sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)) << endl;
      |              ^
a.cc:11:20: error: stray '#' in program
   11 | &#160;&#160;&#160;&#160;cout << fixed << sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)) << endl;
      |                    ^
a.cc:12:2: error: stray '#' in program
   12 | &#160;
      |  ^
a.cc:13:2: error: stray '#' in program
   13 | &#160;&#160;&#160;&#160;return 0;
      |  ^
a.cc:13:8: error: stray '#' in program
   13 | &#160;&#160;&#160;&#160;return 0;
      |        ^
a.cc:13:14: error: stray '#' in program
   13 | &#160;&#160;&#160;&#160;return 0;
      |              ^
a.cc:13:20: error: stray '#' in program
   13 | &#160;&#160;&#160;&#160;return 0;
      |                    ^
a.cc:4:3: error: expected unqualified-id before numeric constant
    4 | &#160;
      |   ^~~
a.cc: In function 'int main()':
a.cc:7:3: error: lvalue required as unary '&' operand
    7 | &#160;&#160;&#160;&#160;double x1, y1, x2, y2;
      |   ^~~
a.cc:7:9: error: lvalue required as unary '&' operand
    7 | &#160;&#160;&#160;&#160;double x1, y1, x2, y2;
      |         ^~~
a.cc:7:15: error: lvalue required as unary '&' operand
    7 | &#160;&#160;&#160;&#160;double x1, y1, x2, y2;
      |               ^~~
a.cc:7:21: error: lvalue required as unary '&' operand
    7 | &#160;&#160;&#160;&#160;double x1, y1, x2, y2;
      |                     ^~~
a.cc:8:3: error: lvalue required as unary '&' operand
    8 | &#160;&#160;&#160;&#160;cin >> x1 >> y1 >> x2 >> y2;
      |   ^~~
a.cc:8:9: error: lvalue required as unary '&' operand
    8 | &#160;&#160;&#160;&#160;cin >> x1 >> y1 >> x2 >> y2;
      |         ^~~
a.cc:8:15: error: lvalue required as unary '&' operand
    8 | &#160;&#160;&#160;&#160;cin >> x1 >> y1 >> x2 >> y2;
      |               ^~~
a.cc:8:21: error: lvalue required as unary '&' operand
    8 | &#160;&#160;&#160;&#160;cin >> x1 >> y1 >> x2 >> y2;
      |                     ^~~
a.cc:9:3: error: lvalue required as unary '&' operand
    9 | &#160;
      |   ^~~
a.cc:10:3: error: lvalue required as unary '&' operand
   10 | &#160;&#160;&#160;&#160;cout.precision(8);
      |   ^~~
a.cc:10:9: error: lvalue required as unary '&' operand
   10 | &#160;&#160;&#160;&#160;cout.precision(8);
      |         ^~~
a.cc:10:15: error: lvalue required as unary '&' operand
   10 | &#160;&#160;&#160;&#160;cout.precision(8);
      |               ^~~
a.cc:10:21: error: lvalue required as unary '&' operand
   10 | &#160;&#160;&#160;&#160;cout.precision(8);
      |                     ^~~
a.cc:11:3: error: lvalue required as unary '&' operand
   11 | &#160;&#160;&#160;&#160;cout << fixed << sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)) << endl;
      |   ^~~
a.cc:11:9: error: lvalue required as unary '&' operand
   11 | &#160;&#160;&#160;&#160;cout << fixed << sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)) << endl;
      |         ^~~
a.cc:11:15: error: lvalue required as unary '&' operand
   11 | &#160;&#160;&#160;&#160;cout << fixed << sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)) << endl;
      |               ^~~
a.cc:11:21: error: lvalue required as unary '&' operand
   11 | &#160;&#160;&#160;&#160;cout << fixed << sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)) << endl;
      |                     ^~~
a.cc:12:3: error: lvalue required as unary '&' operand
   12 | &#160;
      |   ^~~
a.cc:13:3: error: lvalue required as unary '&' operand
   13 | &#160;&#160;&#160;&#160;return 0;
      |   ^~~
a.cc:13:9: error: lvalue required as unary '&' operand
   13 | &#160;&#160;&#160;&#160;return 0;
      |         ^~~
a.cc:13:15: error: lvalue required as unary '&' operand
   13 | &#160;&#160;&#160;&#160;return 0;
      |               ^~~
a.cc:13:21: error: lvalue required as unary '&' operand
   13 | &#160;&#160;&#160;&#160;return 0;
      |                     ^~~