double.c

   1 #include <stdio.h>
   2
   3 void doubleData( float x, float y);
   4 void doubleDataByAddress( float *x, float *y);
   5
   6 main()
   7 {
   8
   9   float x = 10.0;
  10   float y = 5.0;
  11
  12   printf("First Arg: %f\n", x);
  13   printf("Second Arg: %f\n", y);
  14
  15
  16   doubleData(x, y);
  17
  18   printf("First Arg: %f\n", x);
  19   printf("Second Arg: %f\n", y);
  20
  21
  22   doubleDataByAddress(&x, &y);
  23
  24   printf("First Arg: %f\n", x);
  25   printf("Second Arg: %f\n", y);
  26
  27   return 0;
  28
  29 }
  30
  31 void doubleData( float x, float y)
  32 {
  33   x *= 2.0;
  34   y *=  2.0;
  35   printf("First Arg: %f\n", x);
  36   printf("Second Arg: %f\n", y);
  37 }
  38
  39 void doubleDataByAddress( float *x, float *y)
  40 {
  41   *x *= 2.0;
  42   *y *=  2.0;
  43   printf("First Arg: %f\n", *x);
  44   printf("Second Arg: %f\n",* y);
  45 }
  46
  47