Test boolean.

main.cpp

@@ -2,15 +2,12 @@
 
 int main()
 {
-    double zero {0.0};
+    if(-1)
-    double posinf { 5.0 / zero }; // positive infinity
+        std::cout << "-1 is true\n";
-    std::cout << posinf << '\n';
+    if(2)
-
+        std::cout << "2 is true\n";
-    double neginf { -5.0 / zero }; // negative infinity
+    if(1)
-    std::cout << neginf << '\n';
+        std::cout << "1 is true\n";
-
+    if(!0)
-    double nan { zero / zero }; // not a number (mathematically invalid)
+        std::cout << "0 is false\n";
-    std::cout << nan << '\n';
-
-    return 0;
 }