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C/C++ Source or Header  |  1991-08-05  |  375 b   |  13 lines
  1. /* control87.c FUNCTION, FROM P. 204 OF TURBO C */
  2. #include<stdio.h>
  3. #include<float.h>
  4. main()
  5. {
  6.     double a = 0.1;
  7.  
  8.     printf("current control word  = %.4x\n",_control87(0,0));
  9.     _control87(pc_24, MCW_PC);
  10.     printf("0.1 * 0.1 = 0.01 in 24 bit percision = %.15e\n", a*a);
  11.     _control87(CW_DEFUALT, 0xffff);
  12.     printf("0.1 * 0.1 = 0.01 in 64 bit percison = %.15e\n", a*a);
  13. }