large num cpp

Author: offamitkumar

__int128_input_output.cpp

@@ -0,0 +1,39 @@
+
+
+typedef __int128 LInt;
+ostream& operator<<(ostream&cout , LInt number){
+    auto toString = [](LInt num){
+        auto tenPow18 = 1000000000000000000;
+        std::string str;
+        do {
+            long long digits = num % tenPow18;
+            auto digitsStr = std::to_string(digits);
+            auto leading0s = (digits != num) ? std::string(18 - digitsStr.length(), '0') : "";
+            str = leading0s + digitsStr + str;
+            num = (num - digits) / tenPow18;
+        } while (num != 0);
+        return str;
+    };
+    cout << toString(number);
+    return cout;
+}
+
+istream& operator>>(istream&cin , LInt &number){
+    string s; cin >> s; 
+    number = 0;
+    bool neg_flag =false;
+    for(auto&itr:s){
+        if(itr=='-'){
+            neg_flag = true;
+            continue;
+        }
+        number *= 10;
+        number += (itr-'0');
+    }
+    if(neg_flag){
+        number*=(-1);
+    }
+    return cin;
+}
+
+