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View Compilation Error

0_0_2975127_15535.cpp: In member function `void circle::inter_me(circle&, point*, int)':
0_0_2975127_15535.cpp:56: error: `abs' undeclared (first use this function)
0_0_2975127_15535.cpp:56: error: (Each undeclared identifier is reported only once for each function it appears in.)


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