% cat  squares.c

/* squares - Print a table of squares from 1 to 10 */

/*  Written by: C. Severance  - Tue Dec  7 22:58:26 EST 1993 */

main() {

  int i;
  float x,xsq;

/* Generate the table using a loop */

  printf("the first table\n");
  for( i=1; i<=10; i++ ) {
    x = i;
    xsq = x * x;
    printf("%5d %f\n",i,xsq);
  }

/* Print out the table a different way - Use a real number for the index */

  printf("the second table\n");
  for( x=1.0; x<=10.0; x = x + 1.0 ) {
    xsq = x * x;
    printf("%f %f\n",x,xsq);
  }

}
% cc  squares.c
% a.out 
the first table
    1 1.000000
    2 4.000000
    3 9.000000
    4 16.000000
    5 25.000000
    6 36.000000
    7 49.000000
    8 64.000000
    9 81.000000
   10 100.000000
the second table
1.000000 1.000000
2.000000 4.000000
3.000000 9.000000
4.000000 16.000000
5.000000 25.000000
6.000000 36.000000
7.000000 49.000000
8.000000 64.000000
9.000000 81.000000
10.000000 100.000000
%