View Compilation Error

0_0_3915933_10416.cpp: In function `int main()':
0_0_3915933_10416.cpp:6: error: `s' does not name a type
0_0_3915933_10416.cpp:13: error: `s' undeclared (first use this function)
0_0_3915933_10416.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3915933_10416.cpp:13: error: `sum' undeclared (first use this function)