proper square root character for windows

Author: rjawesome

inc/fraction.h

@@ -14,6 +14,14 @@ struct Fraction {
 
 struct Error; // defined in utils.h
 
+#ifdef _WIN32
+    const char SQRT_CH[2] = {(char)251, (char)0};
+    const int SQRT_LEN = 1;
+#else
+    const char SQRT_CH[4] = "√";
+    const int SQRT_LEN = 3;
+#endif
+
 void print_frac(Fraction const &m);
 Error load_frac(string s, Fraction &m);
 Fraction mul_frac(Fraction a, Fraction b);

src/evaluator.cpp

@@ -1,7 +1,7 @@
 #include "evaluator.h"
 
 set<char> banned_var_starts{'1','2','3','4','5','6','7','8','9','0','/','-'};
-set<char> frac_start{'-','1','2','3','4','5','6','7','8','9',"√"[0]};
+set<char> frac_start{'-','1','2','3','4','5','6','7','8','9',SQRT_CH[0]};
 
 inline bool is_ptr(DataType t) {
     return t == TYPE_MATRIX || t == TYPE_VECTOR;

src/fraction.cpp

@@ -45,7 +45,7 @@ void print_frac(Fraction const &m) {
         cout << m.numerator;
     }
     if (m.sqrt != 1 && m.numerator != 0) {
-        cout << "√" << m.sqrt;
+        cout << SQRT_CH << m.sqrt;
     }
     if (m.denominator != 1 && m.numerator != 0) {
         cout << "/" << m.denominator;
@@ -55,9 +55,9 @@ void print_frac(Fraction const &m) {
 Error load_frac(string s, Fraction &m) {
     if (s.find("/") == string::npos) {
         m.denominator = 1;
-        if (s.find("√") != string::npos) {
-            m.sqrt = stoi(s.substr(s.find("√") + 3));
-            string num = s.substr(0, s.find("√"));
+        if (s.find(SQRT_CH) != string::npos) {
+            m.sqrt = stoi(s.substr(s.find(SQRT_CH) + SQRT_LEN));
+            string num = s.substr(0, s.find(SQRT_CH));
             if (num.length() == 0) m.numerator = 1;
             else if (num.length() == 1 && num[0] == '-') m.numerator = -1;
             else m.numerator = stoi(num);
@@ -67,9 +67,9 @@ Error load_frac(string s, Fraction &m) {
         }
     } else {
         string top = s.substr(0, s.find("/"));
-        if (top.find("√") != string::npos) {
-            m.sqrt = stoi(top.substr(top.find("√") + 3));
-            string num = top.substr(0, top.find("√"));
+        if (top.find(SQRT_CH) != string::npos) {
+            m.sqrt = stoi(top.substr(top.find(SQRT_CH) + SQRT_LEN));
+            string num = top.substr(0, top.find(SQRT_CH));
             if (num.length() == 0) m.numerator = 1;
             else if (num.length() == 1 && num[0] == '-') m.numerator = -1;
             else m.numerator = stoi(num);

src/main.cpp

@@ -2,7 +2,7 @@
 
 int main () {
     cin.sync_with_stdio(false);
-    cout << "Square Root: √" << endl;
+    cout << "Square Root: " << SQRT_CH << endl;
     process_expressions();
     return 0;
 }