Use 4 spaces for indentation in test applications

hello/hello-exception.cpp

@@ -3,47 +3,47 @@
 
 class Hello {
 public:
-	Hello() {
-		printf("Hello ctor\n");
-	}
-	~Hello() {
-		printf("Hello dtor\n");
-	}
+    Hello() {
+        printf("Hello ctor\n");
+    }
+    ~Hello() {
+        printf("Hello dtor\n");
+    }
 };
 
 Hello global_h;
 
 class RecurseClass {
 public:
-	RecurseClass(int v) : val(v) {
-		printf("ctor %d\n", val);
-	}
-	~RecurseClass() {
-		printf("dtor %d\n", val);
-	}
+    RecurseClass(int v) : val(v) {
+        printf("ctor %d\n", val);
+    }
+    ~RecurseClass() {
+        printf("dtor %d\n", val);
+    }
 private:
-	int val;
+    int val;
 };
 
 void recurse(int val) {
-	RecurseClass obj(val);
-	if (val == 0) {
-		throw std::exception();
-	}
-	if (val == 5) {
-		try {
-			recurse(val - 1);
-		} catch (std::exception& e) {
-			printf("caught exception at %d\n", val);
-		}
-	} else {
-		recurse(val - 1);
-	}
-	printf("finishing function recurse %d\n", val);
+    RecurseClass obj(val);
+    if (val == 0) {
+        throw std::exception();
+    }
+    if (val == 5) {
+        try {
+            recurse(val - 1);
+        } catch (std::exception& e) {
+            printf("caught exception at %d\n", val);
+        }
+    } else {
+        recurse(val - 1);
+    }
+    printf("finishing function recurse %d\n", val);
 }
 
 int main(int argc, char* argv[]) {
-	std::cout<<"Hello world C++"<<std::endl;
-	recurse(10);
-	return 0;
+    std::cout<<"Hello world C++"<<std::endl;
+    recurse(10);
+    return 0;
 }