make room for a task before fractional numbers

1 files changed, 60 insertions, 0 deletions

diff --git a/tutorial/task9-hint2.mu b/tutorial/task9-hint2.mu
new file mode 100644
index 00000000..97ccfc51
--- /dev/null
+++ b/tutorial/task9-hint2.mu
@@ -0,0 +1,60 @@
+fn to-km miles: float -> _/xmm1: float {
+  var result/xmm1: float <- copy miles
+  # fill in the blanks to compute miles * 1.609
+  # 1.609 = 1609 / 1000 (use function `rational`)
+  # 1609 = 0x649 in hex
+  # 1000 = 0x3e8 in hex
+
+  return result
+}
+
+fn test-to-km {
+  # 0 miles = 0 km
+  var zero: float  # Mu implicitly initializes variables in memory to 0
+  var result/xmm1: float <- to-km zero
+  compare result, zero
+  {
+    break-if-=
+    draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "F - 0 miles = 0 km\n", 3/fg 0/bg
+    count-test-failure
+  }
+  # 1 mile = 1.609 km approximately
+  var one/eax: int <- copy 1
+  var one-float/xmm0: float <- convert one
+  result <- to-km one-float
+  var lower-bound/xmm0: float <- rational 0x649, 0x3e8  # 1609/1000 in hex
+  {
+    compare result, lower-bound
+    break-if-float>=
+    draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "F - 1 mile > 1.609 km\n", 3/fg 0/bg
+    count-test-failure
+  }
+  var upper-bound/xmm0: float <- rational 0x64a, 0x3e8  # 1610/1000 in hex
+  {
+    compare result, upper-bound
+    break-if-float<=
+    draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "F - 1 mile < 1.610 km\n", 3/fg 0/bg
+    count-test-failure
+  }
+  # 2 miles = 3.218 km approximately
+  var two/eax: int <- copy 2
+  var two-float/xmm0: float <- convert two
+  result <- to-km two-float
+  var lower-bound/xmm0: float <- rational 0xc92, 0x3e8  # 3218/1000 in hex
+  {
+    compare result, lower-bound
+    break-if-float>=
+    draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "F - 2 miles > 3.218 km\n", 3/fg 0/bg
+    count-test-failure
+  }
+  var upper-bound/xmm0: float <- rational 0xc93, 0x3e8  # 3219/1000 in hex
+  {
+    compare result, upper-bound
+    break-if-float<=
+    draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "F - 2 miles < 3.219 km\n", 3/fg 0/bg
+    count-test-failure
+  }
+}
+
+fn main {
+}