Shows a different result when divided by float 1 and int 1

Question

This is what I am getting and I don't get why this output is coming. when I change float to int it is giving proper output.

int delta=99999997/(float)1;     
cout<<delta<<endl;

Output: 100000000

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Answer 1

When you divide an integer by a floating point number, the integer is converted to a floating-point number.

The reason for the weird result is that 99999997 cannot be represented exactly in a 32 bit floating point number with the precision used by C++'s float on your architecture.

Instead, when converted to a float, this number gets rounded to the next number which is representable. And that number … happens to be 100000000.