View Compilation Error

0_0_10156369_21120.cpp: In function `int main()':
0_0_10156369_21120.cpp:16: error: `ans' undeclared (first use this function)
0_0_10156369_21120.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10156369_21120.cpp:16: error: `tmp' undeclared (first use this function)