• The C Programming Language.

/* Hello World program */
 
#include<stdio.h>
 
main()
{
    printf("Hello World");
 
 
}

Compile and run the program:

$ gcc -Wall hello.c -o hello.out
hello.c:6: warning: return type defaults to ‘int’
hello.c: In function ‘main’:
hello.c:10: warning: control reaches end of non-void function
 
$ ./hello.out 
Hello World

#include <stdio.h>   /* required for file operations */
 
FILE *fr;            /* declare the file pointer */
 
main()
 
{
   char line[80];
 
   fr = fopen ("./file.txt", "rt");  /* open the file for reading */
   /* "rt" means open the file for reading text */
 
   while(fgets(line, 1024, fr) != NULL)
   {
         printf ("%s\n", line);
   }
   fclose(fr);  /* close the file prior to exiting the routine */
}

for line in open("./file.txt", "r"):
    print line