[6566] in Athena Bugs
vax 7.1H: C compiler / preprocessor
daemon@ATHENA.MIT.EDU (daemon@ATHENA.MIT.EDU)
Fri Dec 7 13:10:24 1990
From: ellis@ATHENA.MIT.EDU
To: bugs@ATHENA.MIT.EDU
Date: Fri, 07 Dec 90 13:09:26 EST
System name: m33-222-6
Type and version: CVAXSTAR 7.1H
Display type: SM
What were you trying to do?
Run this program:
#include <stdio.h>
static float w[] = { 1.,2. ,3., 4. };
static float sqrarg;
#define SQR(a) (sqrarg=(a),sqrarg*sqrarg)
/* #define SQR(a) ( a*a ) */
main()
{
float a1,a2,a3,a4;
a1 = SQR(w[0]);
a2 = SQR(w[1]);
a3 = SQR(w[2]);
a4 = SQR(w[3]);
printf("%f %f %f %f \n",a1,a2,a3,a4);
printf("%f %f %f %f \n",SQR(w[0]),SQR(w[1]),SQR(w[2]),SQR(w[3]));
}
What's wrong:
program should produce identical lines of output. here is actual
output:
1.000000 4.000000 9.000000 16.000000
16.000000 16.000000 16.000000 16.000000
What should have happened:
both lines should be identical
Please describe any relevant documentation references:
???
