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    <p>Using your source code &hellip;</p> <pre><code>#include &lt;iostream&gt; //includes using namespace std; int makedreieck(int länge) // function for drawing a triangle { int rows=0; //rows int draw=0; //drawed while(draw &lt;= länge) { draw++; cout &lt;&lt; "*"; if(draw == länge-1) { rows++; draw = länge-rows; cout &lt;&lt; endl; } if(draw == 1) { getchar(); return 0; } } } int main(char argument) { int dreieck; cin &gt;&gt; dreieck; makedreieck(dreieck); getchar(); return 0; } </code></pre> <p>the first few compilation errors with g++, &hellip;</p> <pre> [d:\dev\test] > <i>gnuc foo.cpp</i> foo.cpp:3:1: error: stray '\344' in program foo.cpp:7:5: error: stray '\344' in program foo.cpp:11:9: error: stray '\344' in program foo.cpp:14:13: error: stray '\344' in program foo.cpp:3:23: error: expected ',' or '...' before 'nge' foo.cpp: In function 'int makedreieck(int)': foo.cpp:7:21: error: expected ')' before 'nge' foo.cpp:7:21: error: 'nge' was not declared in this scope foo.cpp:7:24: error: expected ';' before ')' token foo.cpp:5:9: warning: unused variable 'rows' [-Wunused-variable] foo.cpp:32:1: error: expected '}' at end of input foo.cpp:32:1: warning: no return statement in function returning non-void [-Wreturn-type] [d:\dev\test] > _ </pre> <p>are due to the MingW g++ compiler for Windows not conforming to the C++ standard about the character set accepted in identifiers. The particular character numbers reported are a bit odd because the source code was saved as Windows ANSI Western, but g++ errs out also with the source code as UTF-8. As of 2013 <em>few compilers are</em> conforming wrt. the source character set.</p> <p>The only safe characters are A through Z, underscore, and the digits 0 through 9.</p> <p>In practice this means: <strong>write your source code in English</strong>, the <em>lingua franca</em> of software development, and then it can be maintained by others and compiled by other compilers.</p> <p>After fixing that I get the following compilation errors:</p> <pre> [d:\dev\test] > <i>gnuc foo.cpp</i> foo.cpp: In function 'int makedreieck(int)': foo.cpp:19:21: error: 'getchar' was not declared in this scope foo.cpp: At global scope: foo.cpp:25:5: warning: first argument of 'int main(char)' should be 'int' [-Wmain] foo.cpp:25:5: warning: 'int main(char)' takes only zero or two arguments [-Wmain] foo.cpp: In function 'int main(char)': foo.cpp:30:13: error: 'getchar' was not declared in this scope foo.cpp: In function 'int makedreieck(int)': foo.cpp:23:1: warning: control reaches end of non-void function [-Wreturn-type] [d:\dev\test] > _ </pre> <p>The errors here are due to not including the header <code>&lt;stdio.h&gt;</code> that declares the <code>getchar</code> function.</p> <p>After fixing that there are no more errors reported.</p> <p>However, the warnings are serious:</p> <pre> [d:\dev\test] > <i>gnuc foo.cpp</i> foo.cpp:27:5: warning: first argument of 'int main(char)' should be 'int' [-Wmain foo.cpp:27:5: warning: 'int main(char)' takes only zero or two arguments [-Wmain] foo.cpp: In function 'int makedreieck(int)': foo.cpp:25:1: warning: control reaches end of non-void function [-Wreturn-type] [d:\dev\test] > _ </pre> <p>The non-standard <code>main</code> signature means that even after including the required header, this is <em>not valid C++</em>.</p> <p>Just remove the (unused) formal argument.</p> <p>Then the code compiles, with only one very serious warning remaining:</p> <pre> [d:\dev\test] > <i>gnuc foo.cpp</i> foo.cpp: In function 'int makedreieck(int)': foo.cpp:25:1: warning: control reaches end of non-void function [-Wreturn-type] [d:\dev\test] > _ </pre> <p>Which absolutely needs to be fixed!</p> <p>Summing up:</p> <ul> <li><p>Change the code to not use non-English letters in identifiers. Those national characters are OK wrt. the C++ standard, but few compilers support them. In particular g++ does not.</p></li> <li><p>Include all required headers.</p></li> <li><p>Use a standard-conforming signature for <code>main</code>.</p></li> </ul> <p>And remember to fix the missing <code>return</code> statement thing.</p> <p><em>Then</em> you can start debugging!</p>
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