View Compilation Error

0_0_6348578_26821.cpp: In function `int main()':
0_0_6348578_26821.cpp:31: error: `sumx' undeclared (first use this function)
0_0_6348578_26821.cpp:31: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6348578_26821.cpp:32: error: `sumy' undeclared (first use this function)