program that converts characters like newline, blank and tab into visible sequence like \n, \b and \t

#include < stdio.h>
#include< conio.h>
#include< string.h>
void main()
{
   char str1[100],str2[100];
   int i=0,j=0;
   clrscr();
   printf("Enter the string with blanks,tabs and new line\n");
   printf("At the end put full stop.\n");
   gets(str1);
   while(str1[i]!='.')
   {
    switch(str1[i])
   {
   case ' ':
              {
              str2[j]=';';
              j++;
              str2[j]='b';
              j++;
              i++;
                break;
             }
  case '\t':
              {
               str2[j]=';';
              j++;
              str2[j]='t';
              j++;
              i++;
                break;
              }
  case '\n':
              {
              str2[j]=';';
              j++;
              str2[j]='n';
              j++;
              i++;
                break;
              }
  default :
             {
             str2[j]=str1[i];
             j++;
             i++;
              break;
             }
   }
 }
 str2[j]='\0';
 for(i=0;i<=strlen(str2);i++)
 {
 if(str2[i]==';')
 printf("\\");
 else
 printf("%c",str2[i]);
 }
   getch();
}