Why does the addition of two float numbers is incorrect in C?

Question

I have a problem with the addition of two float numbers. Code below:

float a = 30000.0f;
float b = 4499722832.0f;

printf(\"%f\\n\", a+b);

Answer 1

From wikipedia

Single precision, called "float" in the C language family, and "real" or "real*4" in Fortran. This is a binary format that occupies 32 bits (4 bytes) and its significand has a precision of 24 bits (about 7 decimal digits).

So your number doesn't actually fit in float. You can use double instead.