cmplxdivide.c

// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// This C program generates the file cmplxdivide1.go. It uses the
// output of the operations by C99 as the reference to check
// the implementation of complex numbers in Go.
// The generated file, cmplxdivide1.go, is compiled along
// with the driver cmplxdivide.go (the names are confusing
// and unimaginative) to run the actual test. This is done by
// the usual test runner.
//
// The file cmplxdivide1.go is checked in to the repository, but
// if it needs to be regenerated, compile and run this C program
// like this:
//	gcc '-std=c99' cmplxdivide.c && a.out >cmplxdivide1.go

#include <complex.h>
#include <math.h>
#include <stdio.h>
#include <string.h>

#define nelem(x) (sizeof(x)/sizeof((x)[0]))

double f[] = {
	0.0,
	-0.0,
	1.0,
	-1.0,
	2.0,
	NAN,
	INFINITY,
	-INFINITY,
};

char* fmt(double g) {
	static char buf[10][30];
	static int n;
	char *p;

	p = buf[n++];
	if(n == 10) {
		n = 0;
	}

	sprintf(p, "%g", g);

	if(strcmp(p, "0") == 0) {
		strcpy(p, "zero");
		return p;
	}

	if(strcmp(p, "-0") == 0) {
		strcpy(p, "-zero");
		return p;
	}

	return p;
}

int main(void) {
	int i, j, k, l;
	double complex n, d, q;

	printf("// skip\n");
	printf("// # generated by cmplxdivide.c\n");
	printf("\n");
	printf("package main\n");
	printf("\n");
	printf("import \"math\"\n");
	printf("\n");
	printf("var (\n");
	printf("\tnan     = math.NaN()\n");
	printf("\tinf     = math.Inf(1)\n");
	printf("\tzero    = 0.0\n");
	printf(")\n");
	printf("\n");
	printf("var tests = []struct {\n");
	printf("\tf, g complex128\n");
	printf("\tout  complex128\n");
	printf("}{\n");

	for(i=0; i<nelem(f); i++)
	for(j=0; j<nelem(f); j++)
	for(k=0; k<nelem(f); k++)
	for(l=0; l<nelem(f); l++) {
		n = f[i] + f[j]*I;
		d = f[k] + f[l]*I;
		q = n/d;

		printf("\t{complex(%s, %s), complex(%s, %s), complex(%s, %s)},\n",
			fmt(creal(n)), fmt(cimag(n)),
			fmt(creal(d)), fmt(cimag(d)),
			fmt(creal(q)), fmt(cimag(q)));
	}
	printf("}\n");
	return 0;
}