[user02@FC4 Lesson09]$ cat -n loopvar.c

   1  #include <stdio.h>
   2
   3  int main(void)
   4  {
   5     char letter;
   6     float value;
   7
   8     for (letter = 'A'; letter <= 'Z'; letter++)
   9        printf("%c", letter);
  10
  11     printf("\n");
  12
  13     for (value = 0.0; value <= 1.0; value += 0.1)
  14        printf("%f ", value);
  15
  16     printf("\n");
  17
  18     return 0;
  19  }

[user02@FC4 Lesson09]$ gcc -o loopvar loopvar.c
[user02@FC4 Lesson09]$ ./loopvar
ABCDEFGHIJKLMNOPQRSTUVWXYZ
0.000000 0.100000 0.200000 0.300000 0.400000 0.500000 0.600000 0.700000 0.800000 0.900000