Explain why a 4-byte float has an upper bound of 10³⁸ as depicted in Figure 2.1 of your text?

FIGURE 2.1 Primitive Type Type Name Kind of Value byte short int long Memory Used Range of Values 1 byte 2 bytes 4 bytes 8 bytes 128 to 127 32,768 to 32,767 2,147,483,648 to 2,147,483,647 9,223,372,036,8547,75,808 to 9,223,372,036,854,775,807 3.40282347 x 10+38 to 1.40239846 10-45 1.7976931 3486231 570 x 10+308 to 4.94065 645 841 246544 1 0-324 All Unicode values from 0 to 65,535 Integer Integer Integer Integer float Floating-point 4 bytes double Floating-poin 8 bytes char Single character 2 bytes (Unicode) boolean 1 bit True or false