View Compilation Error

0_0_4457404_21111.cpp: In function `void sushu()':
0_0_4457404_21111.cpp:12: error: `sqrt' undeclared (first use this function)
0_0_4457404_21111.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4457404_21111.cpp:18: error: `count' undeclared (first use this function)
0_0_4457404_21111.cpp: In function `int main()':
0_0_4457404_21111.cpp:26: error: `count' undeclared (first use this function)