Added Pangram Checker in C++ (#736)

Author: piyush-pawar-17

is_pangram/is_pangram.cpp

@@ -0,0 +1,32 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+bool is_pangram(string str) {
+
+	vector<bool> pangram(26, false);
+
+	for (int i = 0; i < str.length(); i++) {
+		if (str[i] >= 'A' && str[i] <= 'Z')
+			pangram[str[i] - 'A'] = true;
+		if (str[i] >= 'a' && str[i] <= 'z')
+			pangram[str[i] - 'a'] = true;
+	}
+
+	for (int i = 0; i < 26; i++)
+		if (!pangram[i])
+			return false;
+
+	return true;
+}
+
+int main() {
+
+	bool pangram = is_pangram("The quick brown fox jumps over the lazy dog");
+	if (pangram)
+		cout << "Given string is a pangram" << endl;
+	else
+		cout << "Given string is not a pangram" << endl;
+
+	return 0;
+}