C/stdio.h/rename

    
//Header file:     #include <stdio.h>  
//Declaration:     int rename(const char *oldfname, const char *newfname); 
//Return:          returns zero on success or nonzero on error. 
  
  #include <stdio.h>
  int main(int argc, char *argv[])
  {
    if(rename("oldName", "newName") != 0){
       printf("Rename Error");
    }
    return 0;
  }