Programming

 
FILE *pfp;
if((pfp = popen("ls", "r")) != NULL)
{
    while(fgets(bufffer, sizeof(buffer)-1, pfp))
    {
        printf("I read: %s\n", buffer);
    }
    pclose(pfp);
}

#include<stdio.h>
main()
{
        int c ;
        while((c=getchar())!=EOF)
                putchar(c);
}

  char line[MAX_LINE_LEN];

  line = readline ("prompt > ");
 
  /* If the line has any text in it, save it on the history. */
  if (line && *line)
      add_history (line);

#include<stdio.h>
#define BUFSIZE 1024

main()
{
        char string[BUFSIZE];
        scanf(" %[^\n]",string);
        printf("STRING:%s\n",string);

}