View Compilation Error

0_0_9985396_20782.cpp:1:24: string.h.h: No such file or directory
0_0_9985396_20782.cpp: In function `int main()':
0_0_9985396_20782.cpp:13: error: `isalpha' undeclared (first use this function)
0_0_9985396_20782.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9985396_20782.cpp:20: error: `isalnum' undeclared (first use this function)