View Compilation Error

0_0_9816371_13221.cpp: In function `int main()':
0_0_9816371_13221.cpp:29: error: `startb' undeclared (first use this function)
0_0_9816371_13221.cpp:29: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9816371_13221.cpp:29: error: `starta' undeclared (first use this function)