View Compilation Error

371821_0_0_25828.cpp: In function `int AddNode(MNode*)':
371821_0_0_25828.cpp:53: error: `exit' undeclared (first use this function)
371821_0_0_25828.cpp:53: error: (Each undeclared identifier is reported only once for each function it appears in.)
371821_0_0_25828.cpp: In function `int main()':
371821_0_0_25828.cpp:64: error: `memset' undeclared (first use this function)
371821_0_0_25828.cpp:65: error: `malloc' undeclared (first use this function)
371821_0_0_25828.cpp:102: error: `exit' undeclared (first use this function)