View Compilation Error

0_0_7313121_21487.cpp: In function `std::string calc(int, int)':
0_0_7313121_21487.cpp:27: error: `count' undeclared (first use this function)
0_0_7313121_21487.cpp:27: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7313121_21487.cpp: In function `int main()':
0_0_7313121_21487.cpp:53: error: `count' undeclared (first use this function)