[backend]将testdata/下的测例替换为了赛方测试用例，更新了测试脚本

testdata/functional/95_float.sy

@@ -0,0 +1,98 @@
+// float global constants
+const float RADIUS = 5.5, PI = 03.141592653589793, EPS = 1e-6;
+
+// hexadecimal float constant
+const float PI_HEX = 0x1.921fb6p+1, HEX2 = 0x.AP-3;
+
+// float constant evaluation
+const float FACT = -.33E+5, EVAL1 = PI * RADIUS * RADIUS, EVAL2 = 2 * PI_HEX * RADIUS, EVAL3 = PI * 2 * RADIUS;
+
+// float constant implicit conversion
+const float CONV1 = 233, CONV2 = 0xfff;
+const int MAX = 1e9, TWO = 2.9, THREE = 3.2, FIVE = TWO + THREE;
+
+// float -> float function
+float float_abs(float x) {
+  if (x < 0) return -x;
+  return x;
+}
+
+// int -> float function & float/int expression
+float circle_area(int radius) {
+  return (PI * radius * radius + (radius * radius) * PI) / 2;
+}
+
+// float -> float -> int function & float/int expression
+int float_eq(float a, float b) {
+  if (float_abs(a - b) < EPS) {
+    return 1 * 2. / 2;
+  } else {
+    return 0;
+  }
+}
+
+void error() {
+  putch(101);
+  putch(114);
+  putch(114);
+  putch(111);
+  putch(114);
+  putch(10);
+}
+
+void ok() {
+  putch(111);
+  putch(107);
+  putch(10);
+}
+
+void assert(int cond) {
+  if (!cond) {
+    error();
+  } else {
+    ok();
+  }
+}
+
+void assert_not(int cond) {
+  if (cond) {
+    error();
+  } else {
+    ok();
+  }
+}
+
+int main() {
+  assert_not(float_eq(HEX2, FACT));
+  assert_not(float_eq(EVAL1, EVAL2));
+  assert(float_eq(EVAL2, EVAL3));
+  assert(float_eq(circle_area(RADIUS) /* f->i implicit conversion */,
+                  circle_area(FIVE)));
+  assert_not(float_eq(CONV1, CONV2) /* i->f implicit conversion */);
+
+  // float conditional expressions
+  if (1.5) ok();
+  if (!!3.3) ok();
+  if (.0 && 3) error();
+  if (0 || 0.3) ok();
+
+  // float array & I/O functions
+  int i = 1, p = 0;
+  float arr[10] = {1., 2};
+  int len = getfarray(arr);
+  while (i < MAX) {
+    float input = getfloat();
+    float area = PI * input * input, area_trunc = circle_area(input);
+    arr[p] = arr[p] + input;
+
+    putfloat(area);
+    putch(32);
+    putint(area_trunc); // f->i implicit conversion
+    putch(10);
+
+    i = i * - -1e1;
+    p = p + 1;
+  }
+  putfarray(len, arr);
+  return 0;
+}