half of 4th seminar

seminar04_templates/02_last_digits/main.cpp

@@ -0,0 +1,58 @@
+#include <iostream>
+#include <vector>
+#include <span>
+
+using std::cout, std::endl, std::vector, std::span;
+
+vector<int> lastDigits1(const vector<int>& v) {
+    vector<int> result;
+    size_t size = v.size();
+    for(int i = 0; i < size; ++i) {
+        result.push_back(v[i] % 10);
+    }
+    return result;
+}
+void lastDigits2(vector<int>& v) {
+    size_t size = v.size();
+    for(int i = 0; i < size; ++i) {
+        v[i] %= 10;
+    }
+}
+
+void lastDigits3(vector<int>* pv) {
+    size_t size = pv->size();
+    for(int i = 0; i < size; ++i)
+            (*pv)[i] %= 10;
+}
+
+void lastDigits4(span<int> sp) {
+    size_t size = sp.size();
+    for(int i = 0; i < size; ++i)
+            sp[i] %= 10;
+}
+
+std::ostream& operator<<(std::ostream& out, const vector<int>& v) {
+    cout << "[";
+    size_t size = v.size();
+    for(int i = 0; i < size; ++i)
+        cout << v[i] << (i == size - 1 ? "]" : " ");
+    return out;
+}
+
+int main() {
+    vector<int> meow{1, 2, 3, 12, 45, 32,313123,3245};
+    vector<int> result1 = lastDigits1(meow);
+    cout << result1 << endl;
+
+    vector<int> result2 = meow;
+    lastDigits2(result2);
+    cout << result2 << endl;
+
+    vector<int> result3 = meow;
+    lastDigits3(&result3);
+    cout << result3 << endl;
+
+    span<int> sp = meow;
+    lastDigits4(sp);
+    cout << meow << endl;
+}