View Compilation Error

0_0_29474760_8016.cpp: In function 'int main()':
0_0_29474760_8016.cpp:6:24: error: invalid operands of types 'const char [9]' and 'int' to binary 'operator&'
 while(scanf("%d%d%d%d"&x1,&y1,&x2,&y2)!=EOF)
                        ^
0_0_29474760_8016.cpp:8:43: error: 'sqrt' was not declared in this scope
     m=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
                                           ^