add show_histogram_text in text.cpp

Histogram/text.cpp

@@ -1 +1,27 @@
+#include "text.h"
+#include <iostream>
+#include <vector>
 
+void show_histogram_text(const std::vector<size_t>& bins) {
+    const size_t SCREEN_WIDTH = 80;
+    const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
+    size_t max_bin = 0;
+    for (size_t bin : bins) {
+        if (bin > max_bin) {
+            max_bin = bin;
+        }
+    }
+    for (size_t bin_value : bins) {
+        if (bin_value < 100) std::cout << " ";
+        if (bin_value < 10) std::cout << " ";
+        std::cout << bin_value << " |";
+        size_t height = bin_value;
+        if (max_bin > MAX_ASTERISK) {
+            height = static_cast<size_t>(MAX_ASTERISK * (static_cast<double>(bin_value) / max_bin));
+        }
+        for (size_t i = 0; i < height; ++i) {
+            std::cout << "*";
+        }
+        std::cout << "\n";
+    }
+};