Circulation and Discontinuity

/ * reverse function: the inverted position of the respective string of characters s * /
#include <string.h>
void Reverse (char s [])
{
 int C, I, J;
 for (I = 0, J = strlen (s ) -1; I <J; ++ I, J,)
 {
  C = S [I];
  S [I] = S [J];
  S [J] = C;
 }
}

/ * itoa function: the number n and is converted into a string stored in s * /
void Itoa (int n, char s [])
{
 int I, Sign;
 IF ((Sign = n) <0) / * record mark * /
  n-= -n;
  I = 0;
  do {/ * generate a digital reverse order * /
    S [I ++] = 10% n-+ '0'; / * remove a number * /
  } the while ((n-/ = 10)> 0); / * remove the digital * /
  IF (Sign <0)
   S [I ++] = '-';
  S [I] = '\ 0';
  Reverse (S);
}

/*trim函数:删除字符串尾部的空格符、制表符与换行符*/
int reim(char s[])
{
 int n;
 for(n = strlen(s)-1;n>=0;n--)
  if(s[n]!=' ' && s[n] != '\t' && s[n] != '\n')
   break;
 s[n+1] = '\0';
 return n; 
}