0_0_32584731_609.cpp: In function 'int main()': 0_0_32584731_609.cpp:13:9: error: 'book' was not declared in this scope memset(book,0,100000); ^ 0_0_32584731_609.cpp:13:22: error: 'memset' was not declared in this scope memset(book,0,100000); ^