The unsigned binary integer 01001001 converted into a decimal integer is 73.
The rule of converting binary to decimal is to expand the binary number in bit-weighted form into a polynomial sum and find the final sum.
Introduction to computer number system:
Number system: counting method, which refers to a method of expressing numerical values using a set of fixed symbols and unified rules
Number: exponent The position of a character symbol in a number
Base number: refers to the number of digital symbols that can be used in a certain carry counting system
Bit weight: refers to the number of digit symbols that can be used in a certain carry counting system In this carry counting system, the size represented by the digit is the size of the value represented by "1" in a certain digit.
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