- Added Swift solution.

1 files changed, 63 insertions, 0 deletions

diff --git a/challenge-070/mohammad-anwar/swift/ch-1.swift b/challenge-070/mohammad-anwar/swift/ch-1.swift
new file mode 100755
index 0000000000..350cee1041
--- /dev/null
+++ b/challenge-070/mohammad-anwar/swift/ch-1.swift
@@ -0,0 +1,63 @@
+import Foundation
+
+/*
+Perl Weekly Challenge - 070
+
+Task #1: Character Swapping
+
+https://perlweeklychallenge.org/blog/perl-weekly-challenge-070
+*/
+
+enum ParamError: Error {
+    case missingStringCountAndOffset
+    case missingCountAndOffset
+    case missingOffset
+}
+
+do {
+    let paramCount:Int = Int(CommandLine.argc)
+
+    if paramCount <= 1 {
+        throw ParamError.missingStringCountAndOffset
+    }
+    else if paramCount <= 2 {
+        throw ParamError.missingCountAndOffset
+    }
+    else if paramCount <= 3 {
+        throw ParamError.missingOffset
+    }
+
+    let string:String = String(CommandLine.arguments[1])
+    let count:String  = String(CommandLine.arguments[2])
+    let offset:String = String(CommandLine.arguments[3])
+
+    let o:Int = Int(offset)!
+    let l:Int = string.count;
+
+    // split string
+    var s:[Character] = []
+    for c in string {
+        s.append(c)
+    }
+
+    for i in 1...Int(count)! {
+        let a:Int = i % l;
+        let b:Int = (i + o) % l;
+        (s[a], s[b]) = (s[b], s[a]);
+    }
+
+    // join array of characters
+    print(String(s))
+}
+catch ParamError.missingStringCountAndOffset {
+    print("Missing String, Count and Offset")
+}
+catch ParamError.missingCountAndOffset {
+    print("Missing Count and Offset")
+}
+catch ParamError.missingOffset {
+    print("Missing Offset")
+}
+catch let error {
+    print(error)
+}