Carry addition, one of mathematical operations, one of addition. For example, in decimal system, if the number of digits on one digit adds up to ten, then write the number of digits added up on this digit and input the number on the tenth digit to the next digit.

A mathematical operation, an addition. When two numbers are added, every time the result of a certain bit is greater than or equal to 10, you need to count 1 to the next bit, which is the carry.

Such as: 48+56= 104, 8+6 =14 >; 10 goes up one digit (ten digits) to 1, 4+5 plus 1, that is, 4+5+ 1= 10 also needs to go up one digit (ten digits) to 1. When there is carry addition in the operation, it is called ".

Extended data carry is a form of operation. In addition, when the number on each bit is equal to the radix, the previous bit goes into 1. It is part of the standard algorithm, starting with the rightmost number and then passing it to the left. For example, when the sum of 6 and 7 is equal to 13 in decimal, the right column writes "3" and the left column writes the resulting carry "1". ?

The ten digits are converted to the next digit, which in this case is 3- 1 in ten columns. According to this method, the word "borrow" is incorrect, because ten is never returned.

Copy ten digits from the next digit on the left, and then add it to the negative sign in the borrowing column to "return it". In this example, 4-( 1+ 1) is listed in the tenth column.