Initial project import

tools/v/vlib/strconv/converter_test.v

@@ -0,0 +1,53 @@
+module main
+
+fn test_issue_16448() {
+	float_prec := 1.9999999999999999 + 0.0000000000000000005
+	assert float_prec > 1.99
+	assert float_prec < 2.01
+}
+
+fn test_atof_converter() {
+	mut float_prec := 1.9999999999999999 + 0.0000000000000000005
+	assert float_prec == 2.0
+	float_prec = 3.9999999999999999 + 0.0000000000000000005
+	assert float_prec == 4.0
+	float_prec = -3.9999999999999999 - 0.0000000000000000005
+	assert float_prec == -4.0
+	float_prec = -1.9999999999999999 - 0.0000000000000000005
+	assert float_prec == -2.0
+	float_prec = 0.025 + 0.0000000000000000005
+	assert float_prec == 0.025
+	float_prec = 0.0625 + 0.0000000000000000005
+	assert float_prec == 0.0625
+	float_prec = 0.0009765625 + 0.0000000000000000005
+	assert float_prec > 0.00097656250 && float_prec < 0.00097656251
+	float_prec = -0.025 - 0.0000000000000000005
+	assert float_prec == -0.025
+	float_prec = -0.0625 - 0.0000000000000000005
+	assert float_prec == -0.0625
+	float_prec = -0.0009765625 - 0.0000000000000000005
+	assert float_prec < -0.00097656250 && float_prec > -0.00097656251
+}
+
+// Testing all the numbers between -100E6..100E6 takes over a minute with clang on i3
+// while for just -1E5..1E5, it takes less than a second.
+// const r = i64(100_000_001)
+// const r = i64(17_000_001)
+const r = i64(100_001)
+
+fn test_renormalisation_inside_converter() {
+	for i in -r .. r {
+		s := '${i}.9999999999999999999'
+		fs := s.f64()
+		ifs := i64(fs)
+		if i % 10000 == 0 {
+			eprintln('>>> s: ${s:30s} | fs: ${fs:20.6f} | ifs: ${ifs:20}')
+		}
+		if i < 0 && ifs != i - 1 {
+			panic('invalid negative  f64 value, i: ${i} | s: ${s} | fs: ${fs} | ifs: ${ifs}')
+		}
+		if i > 0 && ifs != i + 1 {
+			panic('invalid positive  f64 value, i: ${i} | s: ${s} | fs: ${fs} | ifs: ${ifs}')
+		}
+	}
+}