scc

simple c99 compiler
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0070-difftime.c (365B)

      1 /*
      2 output:
      3 testing
      4 done
      5 end:
      6 */
      7 
      8 #include <assert.h>
      9 #include <stdio.h>
     10 #include <time.h>
     11 
     12 int
     13 test(void)
     14 {
     15 	double d1, d2;
     16 	time_t t1, t2;
     17 
     18 	for (t1 = t2 = time(NULL); difftime(t2, t1) < 1; t2 = time(NULL))
     19 		;
     20 
     21 	d1 = difftime(t1, t2);
     22 	d2 = difftime(t2, t1);
     23 	assert(d1 + d2 < 0.00005);
     24 }
     25 
     26 int
     27 main(void)
     28 {
     29 	puts("testing");
     30 	test();
     31 	puts("done");
     32 
     33 	return 0;
     34 }