Function rename () in C

This function is used to change the name of file. Its prototype may be written as given below.

int rename(const char* Old_name, const char * New_name);

After the operation of this function, the file is no longer accessible with the old name. It becomes accessible with the new name only.

Illustrates rename () functions

#include <stdio.h> 
 #include <stdlib.h> 
 void main() 
 { 
    FILE* fptr; // declaration of filepointer 
    fptr = fopen("Student_file","w"); /*opens a filefor writing*/ 
    clrscr(); 
    if(fptr ==NULL) /* check if not opened*/ 
      { 
         printf("File could not be opened"); 
         exit(1); 
      } 
    else 
         printf("File Student file is open for writing.\n"); 
          rename ("Student_file", "Teacher_file"); /* rename the file*/ 
          fptr = fopen("Teacher_file", "a"); /*open with new name*/ 
          if(fptr ==NULL) /* check for failure */ 
           printf("File with name Teacher file not accessible.\n"); 
           printf ("The file is now accessible with 'name Teacher _file.\n") ; 
             rename ("Teacher_file", "Myfile"); 
                     /*The above code Changes file name to Myfile.*/ 
             if(fptr== NULL) 
                 printf( "The file not accessible."); 
                 fptr = fopen ("Myfile", "a"); //open Myfile for appending 
                 if(fptr ==NULL) 
                      { 
                          printf("Myfile is not accessible"); 
                          exit (1); 
                      } 
                 else 
                   printf("The file with name Myfile is open for appending.\n"); 
                   fclose(fptr);  
 } //close file stream