What are the function exercises in C language?

Editor to share with you what the C language function exercises, I believe that most people do not know much, so share this article for your reference, I hope you will learn a lot after reading this article, let's go to know it!

Question 1: string reverse (Recursive implementation)

Method 1, non-recursive implementation

Main body part

The array name is the address of the first element

The first element is the char type, and the corresponding parameter passing element used to be the char* type.

The reverse order is achieved by using two pointers to move continuously, and then exchanging the elements of the two positions.

Method 2, recursive implementation

General train of thought

Code implementation (it is recommended to simulate it manually)

Void reverse_string (char* str) {int len = strlen (str); char tmp = str [0]; str [0] = str [len-1]; str [len-1] ='\ 0mm; if (strlen (str + 1) > = 2) reverse_string (str + 1); str [len-1] = tmp;}

Question 2: calculate the sum of each person of a number (recursive implementation)

Int DigiSum (unsigned int n) {if (n > 9) {return DigiSum (n / 10) + n% 10;} else {return n;} question 3: recursive realization to the k power of n

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