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#Float Data Type

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#include <iostream>

using namespace std;

int main()
{
    float a,b,c;
    cout<<"Enter a=";
    cin>>a;
    b=a + (1-1);
    cout<<"a + (1-1)="<<b<<endl;
    c=(a+1)-1;
    cout<<" (a+1)-1="<<c;
    getchar();
    
}

Here is a is till 1E-7

c gives us a value .but after a= 1E-8

c gives us 0

can you explain how float data type is working here
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