Merge branch 'master' of github.com:seaker/perlweeklychallenge-club

2 files changed, 99 insertions, 0 deletions

diff --git a/challenge-002/paulo-custodio/cpp/ch-1.cpp b/challenge-002/paulo-custodio/cpp/ch-1.cpp
new file mode 100644
index 0000000000..1399dfe279
--- /dev/null
+++ b/challenge-002/paulo-custodio/cpp/ch-1.cpp
@@ -0,0 +1,18 @@
+/*
+Challenge 002
+
+Challenge #1
+Write a script or one-liner to remove leading zeros from positive numbers.
+*/
+
+#include <iostream>
+#include <cctype>
+
+int main(int argc, char* argv[]) {
+    if (argc==2) {
+        char* p = argv[1];
+        while (*p=='0' && isdigit(p[1]))
+            p++;
+        std::cout << p << std::endl;
+    }
+}
diff --git a/challenge-002/paulo-custodio/cpp/ch-2.cpp b/challenge-002/paulo-custodio/cpp/ch-2.cpp
new file mode 100644
index 0000000000..8a3510766b
--- /dev/null
+++ b/challenge-002/paulo-custodio/cpp/ch-2.cpp
@@ -0,0 +1,81 @@
+/*
+Challenge 002
+
+Challenge #2
+Write a script that can convert integers to and from a base35
+representation, using the characters 0-9 and A-Y. Dave Jacoby came up
+with nice description about base35, in case you needed some background.
+*/
+
+#include <iostream>
+#include <string>
+#include <cctype>
+
+// format a digit
+char format_digit(int n) {
+    if (n < 10)
+        return '0' + n;
+    else
+        return 'A' + n - 10;
+}
+
+// format a number
+std::string format_number(int n, int base) {
+    bool negative = false;
+    std::string str;
+    if (n < 0) {
+        negative = true;
+        n = -n;
+    }
+    do {
+        int d = n % base;
+        n = n / base;
+        str.insert(0, 1, format_digit(d));
+    } while (n > 0);
+    if (negative)
+        str.insert(0, 1, '-');
+    return str;
+}
+
+// scan digit
+int scan_digit(char c) {
+    if (isdigit(c))
+        return c - '0';
+    else if (isalpha(c))
+        return toupper(c) - 'A' + 10;
+    else
+        return -1;
+}
+
+// scan number
+int scan_number(const std::string& str, int base) {
+    const char* p = str.c_str();
+    bool negative = false;
+    int n = 0;
+    if (*p == '-') {
+        negative = true;
+        p++;
+    }
+    while (*p != '\0') {
+        int d = scan_digit(*p++);
+        if (d < 0 || d >= base) {
+            std::cerr << "invalid number" << std::endl;
+            exit(EXIT_FAILURE);
+        }
+        n = n * base + d;
+    }
+    if (negative)
+        n = -n;
+    return n;
+}
+
+int main(int argc, char* argv[]) {
+    if (argc == 2)
+        std::cout << format_number(atoi(argv[1]), 35) << std::endl;
+    else if (argc == 3 && std::string(argv[1]) == "-r")
+        std::cout << scan_number(argv[2], 35) << std::endl;
+    else {
+        std::cerr << "Usage: ch-2 [-r] number" << std::endl;
+        return EXIT_FAILURE;
+    }
+}