View Compilation Error

0_0_9303799_20519.cpp: In function `void prime()':
0_0_9303799_20519.cpp:30: error: `printf' undeclared (first use this function)
0_0_9303799_20519.cpp:30: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9303799_20519.cpp: In function `int main()':
0_0_9303799_20519.cpp:39: error: `scanf' undeclared (first use this function)
0_0_9303799_20519.cpp:46: error: `memset' undeclared (first use this function)