c++ - Problems with strcmp() -

i'm not sure if it's strcmp or function isn't working. here's code in main function.

double findlow(const char* date, const weather *data, int datasize) {     int i, o;     (i = 0; < datasize; i++) {         o = strcmp(data[i].date(), date); //testing         cout << o << ' ' << data[i].date() << date << endl;  //testing         if (strcmp(data[i].date(),date) == 0)             return data[i].low();            }     return 0.0; } 

here's code date() function(public member function).

const char* weather::date() const {     return _datedescription; } 

for reason strcmp function return 1 if strings match. datedescription c-style string of 7 characters , data[i].date() attempts find date in same format datedescription.

also cout not show data[i].date()

edit: when run full code looks this:

days of weather: 3 enter date: oct/1 enter high: 15 enter low : 10 enter date: nov/13 enter high: 10 enter low : 1.1 enter date: dec/15 enter high: 5.5 enter low : -6.5  weather report: date        high  low ====================== oct/1_______15.0__10.0 nov/13______10.0___1.1 dec/15_______5.5__-6.5  enter date looking for: nov/13 1 oct/15 1 nov/13 1 dec/15 low temperature: 0.0(meant show low temp of date requested) 

the 1 isn't showing date variable tested. paste of full code

here's problem:

cin >> query; //(in example stored in char query[7]) // , display found low temprature.  cin.getline(query, 7, '\n'); 

you read in query standard input...and read in again. second time, there's nothing left on line '\n' -- reads in empty string.

i removed cin.getline , got sensible result.

the way detect step through using debugger, , note query "" instead of date typed in.