356366_0_16798.cpp: In function `int main()':
356366_0_16798.cpp:14: error: `strlen' undeclared (first use this function)
356366_0_16798.cpp:14: error: (Each undeclared identifier is reported only once for each function it appears in.)
356366_0_16798.cpp:21: error: `abs' undeclared (first use this function)
356366_0_16798.cpp:23: error: `strcpy' undeclared (first use this function)
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