pra3-02.c

#include <stdio.h>

void escape(char s[], char t[]);
void escape2(char s[], char t[]);
void pstr(char s[]);

int main (int argc, char const *argv[])
{
  char s[100];
  char t[100] = "ab\\scd\\tedsa\\nds\\tadf";
  //pstr(t);
  escape2(s, t);
  printf("%s\n", s);
  return 0;
}

void escape(char s[], char t[])
{
  int i, j;
  i = j = 0;
  while(t[i]!='\0')
  {
    switch (t[i]){
      case '\t':
        s[j++] = '{';
        s[j++] = '\\';
        s[j++] = 't';
        s[j++] = '}';
        ++i;
        break;
      case ' ':
        s[j++] = '{';
        s[j++] = '\\';
        s[j++] = 's';
        s[j++] = '}';
        ++i;
        break;
      case '\n':
        s[j++] = '{';
        s[j++] = '\\';
        s[j++] = 'n';
        s[j++] = '}';
        ++i;
        break;
      default:
        s[j++] = t[i++];
        break;
    }
    
  }
  s[j] = '\0';   
}

void escape2(char s[], char t[])
{
  int i, j;
  i = j = 0;
  while(t[i]!='\0')
  {
    if (t[i] == '\\')
    {
      switch(t[++i])
      {
        case 't':
          s[j++] = '\t';
          ++i;
          break;
        case 's':
          s[j++] = ' ';
          ++i;
          break;
        case 'n':
          s[j++] = '\n';
          ++i;
          break;
        default:
          break;
      }
    }
    else
      s[j++] = t[i++];
  }
  s[j] = '\0';
}
void pstr(char s[]){
  int i = 0;
  while(s[i]!='\0')
    printf("%c", s[i++]);
  printf("%d\n", i);
}