Replace a space in a string with%20

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For example: There is a string we are family, the implemented string is we%20are%20family.

If the space is replaced by a space in front and back, then the family will be moved backwards two times; Now,

Set aside enough space first, move the family first, then move is, when the space is filled.

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C Language code:

# include <stdio.h># include <stdlib.h># include <string.h>#  include <assert.h># define max 50void insert (char *p) {      assert (P);     char *pstart = null;      char *pend = NULL;     int black = 0;      int size = strlen (P);           pstart = p + size;      while  (*P)                           //statistics reserved Spaces number      {           if  (*p ==  '   ')            {               black++;            }          p ++;     }         pend =  pstart +  (black * 2);         while  ( Pstart < pend)      {           if  (*pstart !=  '   ')            {               *pend =  *pstart;                pstart--;               pend--;           }          else           {                *pend-- =  ' 0 ';                *pend-- =  ' 2 ';                *pend-- =  '% ';                *pstart--;          }      }}int main () {     char str[max] =  " ";           printf (" Please enter string: ");      Gets (str);           insert (str);      printf ("%s\n", str);Nbsp;         system ("pause");      return 0;}

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work tip: The loop statement, the longest cycle should be placed in the most inner layer, the shortest in the outermost, in order to reduce the number of CPU cross-cutting cycle layer, it is recommended for loop control variable to take "half open half closed".

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Replace a space in a string with%20