How to judge whether the input number is decimal in C ++?

Ideas:
Assign the value to a float data type, and then convert the float data to the int type (convert the float data to the int type, and then the int type only retains the integer part of the data ), finally, compare the size of two numbers.

 

# Include <stdio. h> <br/> # include <math. h> <br/> int main (void) <br/>{< br/> float M = 1234.000000; // ==< br/> float M = 1234.111111; //! = <Br/> int n = (INT) m; <br/> If (M = N) <br/> printf ("= "); <br/> else <br/> printf ("! = "); <Br/> return 0; <br/>}