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View Compilation Error

0_0_31064622_24483.cpp: In function 'int main()':
0_0_31064622_24483.cpp:6:48: error: expected ')' before '!' token
     while(scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2)!EOF);
                                                ^
0_0_31064622_24483.cpp:6:52: error: expected ';' before ')' token
     while(scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2)!EOF);
                                                    ^
0_0_31064622_24483.cpp:9:16: error: 'pow' was not declared in this scope
     d=pow(d,0.5);
                ^


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