Program to print the ascii equivalent values of all chararters in the given string

int ascii_value(char c);
void main()
{

 int i,a;
 char c;
 clrscr();
 printf("Please enter any string...");
 printf("String will be terminated if you pressing Ctrl-Z.");
 printf("Enter String: ");
 for (i=0;(c=getchar())!=EOF;i++)
 {
  a=ascii_value(c);
  printf("%d%c",a,' ');
 }
 printf("are the ascii values of the characters of the given string");
 getch();
}

 int ascii_value(char c)
 {
  int a;
  a=(int)c;
  return(a);
 }