Change the array "Student a Am I" to "I am a student".

Topic:

The contents of a character array are : "Student A Am I", please change the contents of the array to "I am a student".

Requirement: Library functions cannot be used. Only a limited space can be opened (the number of spaces is independent of the length of the string).

Topic Analysis:

Because the string given in the topic contains a space character, it is not easy to simply reverse the contents of the array, the problem requires the library function can not be used, and can only open a limited space, can not be related to the length of the string, so you cannot create a same array as the original array to hold the changed string.

#define  _CRT_SECURE_NO_WARNINGS 1#include <stdio.h> #include  <stdlib.h> #include  <assert.h> int my_strlen (CONST&NBSP;CHAR&NBSP;*STR)     // Defines the calculation string length function My_strlen{    int count = 0;    while (*str++ )    {      count++;    }     return count;}  void reverse_str (char *left, char *right)   //define string inverse function {      assert (left),      assert (right);      // The Assert function determines whether it is a blank character      while (left < right)      {          char tmp = *left;          *left = *right;         * Right = tmp;         left++;          right--;     }} void reverse (char arr[])      {     char *pstart = arr;   //defining a string start pointer      char *pend = arr + my_strlen (arr)  - 1;     //defining a String end pointer      char *pcur = NULL;      if ((arr == null)  | |   (arr[0] ==  '))   //determine if the string is empty or the first character is a space      {         return ;          }       reverse_str (pstart, pend);    //inverse of the entire string        while (*arr) &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;{&NBSP;&NBSP;&NBSP;&Nbsp;     pcur = arr;          while (*arr !=  '  && *arr !=  '   ')          {           arr++;         }        pend = arr -  1;        reverse_str (pcur , pend);    / /Invert each word         if (*arr ==  '   ')          {           arr++;         }     }} int main () {     char arr[] =  "Student a am i";     printf ("%s\n",  ARR);      reverse (arr);     printf ("%s\n",  arr); System ("pause"); return 0; } 

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Change the array "Student a Am I" to "I am a student".