guys what is variable can be use in 15-0111 is it integer or something

Answer 1

Use string

Answer 2

Int -> Intergers, 1, 2, 3, 5, 7, 45, 666, 43, 97437

float -> Decimals, 1.0, 2.547, 8.302764
double -> Decimals, 1.0, 2.456, 8.4394, 345.8
What's the differenece you may ask. doubles are more precise. More decimals. Why float? Less memory usage.

Answer 3

Use string, String or char[].