View Compilation Error

0_0_3102393_9695.cpp:4: error: `size' was not declared in this scope
0_0_3102393_9695.cpp:4: error: `size' was not declared in this scope
0_0_3102393_9695.cpp: In function `int main()':
0_0_3102393_9695.cpp:10: error: `f' undeclared (first use this function)
0_0_3102393_9695.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)