Integer reverse output of C language test question 166

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1、 subject

subject ： Store an integer entered from the keyboard into an array , The integer is output in the reverse order of the array through the operation of the program , Use recursive methods to solve problems .

analysis ：
Design functions to store data in reverse order , Set the address where the formal parameter array receives the argument array , To store every bit of data . The function body solves the problem recursively , So consider the conditions for recursion . for example , The data n Store in array s in , if n It's one digit. , Then store n To array ; if n Not a single digit , Then store n/10 To array .

The difficulty in solving the problem lies in finding the storage address of the data , By constantly taking remainder and dividing 10 Get every bit of data . In order to store data in reverse order , Every division 10 When , At the same time, the address of the array where the data is stored is moved back , The first digit thus obtained is stored in the last digit of the array …… By moving forward one by one , Recursive regression , Realize the storage of the whole data . By function convert() Realize the reverse conversion of numbers in the string .