Q43.c

#include<stdio.h>
#include<string.h>
void main(){  
char frame[50][50],str[50][50];
 char flag[10];
 strcpy(flag,"flag");
 char esc[10];
 strcpy(esc,"esc");
 int i,j,k=0,n;
  strcpy(frame[k++],"flag");
 printf("Enter no.of String :\t");
 scanf("%d",&n);
 printf("Enter String \n");
 for(i=0;i<=n;i++)
   {
  gets(str[i]);
   }
 printf("You entered :\n");
 for(i=0;i<=n;i++)
    {
  puts(str[i]);
  }
 printf("\n");
 for(i=1;i<=n;i++)
   {
      if(strcmp(str[i],flag)!=0 && strcmp(str[i],esc)!=0)
            {
                   strcpy(frame[k++],str[i]);
      }
      else
  {
            strcpy(frame[k++],"esc");
            strcpy(frame[k++],str[i]);
         }
   }
 strcpy(frame[k++],"flag");
//frame[k++]='\0';
printf("------------------------------\n");
printf("Byte stuffing at sender side:\n\n");
printf("------------------------------\n");
for(i=0;i<k;i++)
  {
 printf("%s\t",frame[i]);
  }
}