"C and Pointers" section post-programming exercise solution Reference--6.3

"C and Pointers"--6.3

Topic:

Write a function to reverse-arrange the characters in the argument string.

Function Prototypes:

void Reverse_string (char *string);

Requirements:

Use pointers instead of array subscripts

Do not use any function in the C function library to manipulate strings

Do not declare a local array to temporarily store parameter strings

Solution Code:

#include <stdio.h>voidReverse_string (Char*string){    intI, n=0;  while(*(string+N)! =' /')//count the number of characters in a stringn++; N--;//The number of characters n as the index number should be reduced by 1, that is, from 0 to N-1    if(N >0)//There is no need to invert the number of characters equal to 1 o'clock    {         for(i=0; I<= (n/2); i++)        {            if(I! = (ni)) {CharP//Character Content Exchangep = * (string+H); *(string+i) = * (string+n-i); *(string+n-i) =p; }        }    }}intMain () {CharSource[] ="ABCDEFGH"; printf ("before reverse:\n%s\n", source);    Reverse_string (source); printf ("After reverse:\n%s\n", source);    GetChar (); return 0;}

Note:

1. Count the number of non-' s ' characters in the string first

2. The first character turns to Exchange

"C and Pointers" section post-programming exercise solution Reference--6.3