What f means in this code?

float x=12.7; x-=10.6; cout<<(x==2.1f)

11/12/2019 3:38:22 PM

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'f' forces the number to be of type float. A value like 2.1 is of type double by default.

2.1f =>means 2.1 of type float data. 2.1 =>means 2.1 of type double(default case). 2.1d =>means 2.1 of double data type.