View Compilation Error

0_0_9819654_9002.cpp:13: error: expected unqualified-id before numeric constant
0_0_9819654_9002.cpp:13: error: expected `,' or `;' before numeric constant
0_0_9819654_9002.cpp: In function `int main()':
0_0_9819654_9002.cpp:20: error: redefinition of `int main()'
0_0_9819654_9002.cpp:5: error: `int main()' previously defined here
0_0_9819654_9002.cpp:23: error: `abs' undeclared (first use this function)
0_0_9819654_9002.cpp:23: error: (Each undeclared identifier is reported only once for each function it appears in.)