View Compilation Error

0_0_24431619_28453.cpp: In function 'void create()':
0_0_24431619_28453.cpp:12:33: error: 'memset' was not declared in this scope
     memset(index,0,sizeof(index));
                                 ^
0_0_24431619_28453.cpp:13:23: error: 'strlen' was not declared in this scope
     for(i=0;i<strlen(a);i++)
                       ^
0_0_24431619_28453.cpp:19:29: error: 'strlen' was not declared in this scope
     for(i=25,j=0;i>=strlen(a);i--,j++)
                             ^