0_0_7086681_11239.cpp: In function `int main()':
0_0_7086681_11239.cpp:8: error: declaration does not declare anything
0_0_7086681_11239.cpp:13: error: `abs' undeclared (first use this function)
0_0_7086681_11239.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
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