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POCurly brackets and the returned value in the main method
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  1. POCurly brackets and the returned value in the main method
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    copied!<p>I read this <a href="http://www.stroustrup.com/Programming/Solutions/Ch4/e4-5.cpp" rel="nofollow">code</a> (by Bjarne Stroustrup). I am confused... The <code>main</code> function body is not in the <code>{}</code>, and function doesn't return value (as <code>int</code>). And it works... Why?</p> <pre><code>#include "std_lib_facilities.h" int main() try { cout&lt;&lt; "please enter two floating-point values separated by an operator\n The operator can be + - * or / : "; double val1 = 0; double val2 = 0; char op = 0; while (cin&gt;&gt;val1&gt;&gt;op&gt;&gt;val2) { // read number operation number string oper; double result; switch (op) { case '+': oper = "sum of "; result = val1+val2; break; case '-': oper = "difference between "; result = val1-val2; break; case '*': oper = "product of "; result = val1*val2; break; case '/': oper = "ratio of"; if (val2==0) error("trying to divide by zero"); result = val1/val2; break; //case '%': // oper = "remainder of "; // result = val1%val2; // break; default: error("bad operator"); } cout &lt;&lt; oper &lt;&lt; val1 &lt;&lt; " and " &lt;&lt; val2 &lt;&lt; " is " &lt;&lt; result &lt;&lt; '\n'; cout &lt;&lt; "Try again: "; } } catch (runtime_error e) { // this code is to produce error messages; it will be described in Chapter 5 cout &lt;&lt; e.what() &lt;&lt; '\n'; keep_window_open("~"); // For some Windows(tm) setups } catch (...) { // this code is to produce error messages; it will be described in Chapter 5 cout &lt;&lt; "exiting\n"; keep_window_open("~"); // For some Windows(tm) setups } </code></pre>
 

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