modernc.org/gc@v1.0.1-0.20240304020402-f0dba7c97c2b/testdata/errchk/test/cmplxdivide.c (about)

     1  // Copyright 2010 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // This C program generates the file cmplxdivide1.go. It uses the
     6  // output of the operations by C99 as the reference to check
     7  // the implementation of complex numbers in Go.
     8  // The generated file, cmplxdivide1.go, is compiled along
     9  // with the driver cmplxdivide.go (the names are confusing
    10  // and unimaginative) to run the actual test. This is done by
    11  // the usual test runner.
    12  //
    13  // The file cmplxdivide1.go is checked in to the repository, but
    14  // if it needs to be regenerated, compile and run this C program
    15  // like this:
    16  //	gcc '-std=c99' cmplxdivide.c && a.out >cmplxdivide1.go
    17  
    18  #include <complex.h>
    19  #include <math.h>
    20  #include <stdio.h>
    21  #include <string.h>
    22  
    23  #define nelem(x) (sizeof(x)/sizeof((x)[0]))
    24  
    25  double f[] = {
    26  	0.0,
    27  	-0.0,
    28  	1.0,
    29  	-1.0,
    30  	2.0,
    31  	NAN,
    32  	INFINITY,
    33  	-INFINITY,
    34  };
    35  
    36  char* fmt(double g) {
    37  	static char buf[10][30];
    38  	static int n;
    39  	char *p;
    40  
    41  	p = buf[n++];
    42  	if(n == 10) {
    43  		n = 0;
    44  	}
    45  
    46  	sprintf(p, "%g", g);
    47  
    48  	if(strcmp(p, "0") == 0) {
    49  		strcpy(p, "zero");
    50  		return p;
    51  	}
    52  
    53  	if(strcmp(p, "-0") == 0) {
    54  		strcpy(p, "-zero");
    55  		return p;
    56  	}
    57  
    58  	return p;
    59  }
    60  
    61  int main(void) {
    62  	int i, j, k, l;
    63  	double complex n, d, q;
    64  
    65  	printf("// skip\n");
    66  	printf("// # generated by cmplxdivide.c\n");
    67  	printf("\n");
    68  	printf("package main\n");
    69  	printf("\n");
    70  	printf("import \"math\"\n");
    71  	printf("\n");
    72  	printf("var (\n");
    73  	printf("\tnan     = math.NaN()\n");
    74  	printf("\tinf     = math.Inf(1)\n");
    75  	printf("\tzero    = 0.0\n");
    76  	printf(")\n");
    77  	printf("\n");
    78  	printf("var tests = []struct {\n");
    79  	printf("\tf, g complex128\n");
    80  	printf("\tout  complex128\n");
    81  	printf("}{\n");
    82  
    83  	for(i=0; i<nelem(f); i++)
    84  	for(j=0; j<nelem(f); j++)
    85  	for(k=0; k<nelem(f); k++)
    86  	for(l=0; l<nelem(f); l++) {
    87  		n = f[i] + f[j]*I;
    88  		d = f[k] + f[l]*I;
    89  		q = n/d;
    90  
    91  		printf("\t{complex(%s, %s), complex(%s, %s), complex(%s, %s)},\n",
    92  			fmt(creal(n)), fmt(cimag(n)),
    93  			fmt(creal(d)), fmt(cimag(d)),
    94  			fmt(creal(q)), fmt(cimag(q)));
    95  	}
    96  	printf("}\n");
    97  	return 0;
    98  }