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-rw-r--r--7/go.mod3
-rw-r--r--7/main.go33
2 files changed, 36 insertions, 0 deletions
diff --git a/7/go.mod b/7/go.mod
new file mode 100644
index 0000000..b924aab
--- /dev/null
+++ b/7/go.mod
@@ -0,0 +1,3 @@
+module 7
+
+go 1.17
diff --git a/7/main.go b/7/main.go
new file mode 100644
index 0000000..7bf96b8
--- /dev/null
+++ b/7/main.go
@@ -0,0 +1,33 @@
+package main
+
+import "fmt"
+
+func reverse(x int) int {
+ var res int
+ var negative bool
+ if x < 0 {
+ negative = true
+ x = x * -1
+ }
+ for x > 0 {
+ digit := x - ((x / 10) * 10)
+ res = res*10 + digit
+ if res > (0x1 << 31) {
+ return 0
+ }
+ x = x / 10
+ }
+
+ if negative {
+ return res * -1
+ }
+ return res
+}
+
+func main() {
+ fmt.Println(reverse(123))
+ fmt.Println(reverse(-123))
+ fmt.Println(reverse(120))
+ fmt.Println(reverse(1534236469))
+
+}