2 temperature questions with DS18B20

question 1:
i need read 5 ds18b20 temperature sensors. example codes read temperature float, temperatures between 0 , 100 deg c. can read integer?

void loop() {
   sensors.requesttemperatures();
   int value;
   value=sensors.gettempcbyindex(1);

question 2:
in above code, sensors.requesttemperatures() necessary? found example code didn't have it.

thank you.

q1: do. happens?
q2: happens when try?

supplementary. have read documentation?

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