View Compilation Error

0_0_38341023_3886.cpp: In function 'ChCode getCode(char*)':
0_0_38341023_3886.cpp:55:33: error: 'strcmp' was not declared in this scope
     if(strcmp(inputStr, ch_query) == 0)
                                 ^
0_0_38341023_3886.cpp:57:31: error: 'strcmp' was not declared in this scope
     if(strcmp(inputStr, ch_add) == 0)
                               ^
0_0_38341023_3886.cpp:59:31: error: 'strcmp' was not declared in this scope
     if(strcmp(inputStr, ch_sub) == 0)
                               ^
0_0_38341023_3886.cpp:61:31: error: 'strcmp' was not declared in this scope
     if(strcmp(inputStr, ch_end) == 0)
                               ^