View Compilation Error

0_0_19617530_2755.cpp: In function 'void Read(char*)':
0_0_19617530_2755.cpp:13:28: error: 'strcmp' was not declared in this scope
         if(strcmp(tmp,"END")==0) break;  
                            ^
0_0_19617530_2755.cpp:14:22: error: 'strlen' was not declared in this scope
         if(strlen(tmp)!=0) strcat(p,tmp);  
                      ^
0_0_19617530_2755.cpp:14:40: error: 'strcat' was not declared in this scope
         if(strlen(tmp)!=0) strcat(p,tmp);  
                                        ^
0_0_19617530_2755.cpp:15:22: error: 'strcat' was not declared in this scope
         strcat(p,"\n");  
                      ^
0_0_19617530_2755.cpp: In function 'void Process(char*)':
0_0_19617530_2755.cpp:24:17: error: 'strlen' was not declared in this scope
     len=strlen(p);  
                 ^
0_0_19617530_2755.cpp: In function 'int main()':
0_0_19617530_2755.cpp:42:22: error: 'strcmp' was not declared in this scope
         if(strcmp(a,b)==0)  
                      ^