View Compilation Error

0_0_9597800_17065.cpp:5: error: ISO C++ forbids declaration of `wamei' with no type
0_0_9597800_17065.cpp: In function `int wamei(int, int, int, int)':
0_0_9597800_17065.cpp:6: error: `abs' undeclared (first use this function)
0_0_9597800_17065.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)