View Compilation Error

0_0_9256024_16227.cpp: In function `int main()':
0_0_9256024_16227.cpp:20: error: `sum2' undeclared (first use this function)
0_0_9256024_16227.cpp:20: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9256024_16227.cpp:22: error: `sum1' undeclared (first use this function)
0_0_9256024_16227.cpp:27: error: expected `}' at end of input