View Compilation Error

0_0_35248462_9624.cpp:2:11: error: '::main' must return 'int'
 void main()
           ^
0_0_35248462_9624.cpp: In function 'int main()':
0_0_35248462_9624.cpp:19:13: error: 'abs' was not declared in this scope
     if(abs(c)>abs(max))
             ^