tst_abs.c

这是《Keil Cx51 V7.0单片机高级语言编程与uVision2应用实践》教材各章中列出的全部程序例子。

#include <math.h>
#include <stdio.h>                   /* for printf */
void tst_abs (void) {
   int x;
   int y;
   x = -42;
   y = abs (x);
   printf ("ABS(%d) = %d\n", x, y);
}

void tst_cabs (void) {
  char x;
  char y;
  x = -23;
  y = cabs (x);
  printf ("CABS(%bd) = %bd\n", x, y);
}

void tst_fabs (void) {
  float x;
  float y;
  x = 10.2;
  y = fabs (x);
  printf ("FABS(%f) = %f\n", x, y);
  x = -3.6;
  y = fabs (x);
  printf ("FABS(%f) = %f\n", x, y);
}

void tst_labs (void) {
  long x;
  long y;
  x = -12345L;
  y = labs (x);
  printf ("LABS(%ld) = %ld\n", x, y);
}