View Compilation Error

0_0_36051047_13055.cpp: In function 'int main()':
0_0_36051047_13055.cpp:23:46: error: 'strcmp' was not declared in this scope
      while(~scanf("%s",text)&&strcmp(text,"#")){
                                              ^
0_0_36051047_13055.cpp:25:40: error: 'memset' was not declared in this scope
          memset(prefix,0,sizeof(prefix));
                                        ^
0_0_36051047_13055.cpp:26:31: error: 'strlen' was not declared in this scope
         num=0,lena=strlen(text),lenb=strlen(pattern);
                               ^