View Compilation Error

0_0_27662840_29894.cpp: In function 'int main()':
0_0_27662840_29894.cpp:27:40: error: 'strcmp' was not declared in this scope
         if(strcmp(num[i].str,num[j].str)==0){
                                        ^
0_0_27662840_29894.cpp:31:50: error: 'strcmp' was not declared in this scope
         if(j==point&&strcmp(num[i].str,num[j].str)!=0){
                                                  ^