Add config-test

cpp/config-test/config

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+xe-5.2

cpp/config-test/cpp43.cbp

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+<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
+<CodeBlocks_project_file>
+	<FileVersion major="1" minor="6" />
+	<Project>
+		<Option title="cpp43" />
+		<Option pch_mode="2" />
+		<Option compiler="gcc" />
+		<Build>
+			<Target title="Debug">
+				<Option output="bin/Debug/cpp43" prefix_auto="1" extension_auto="1" />
+				<Option object_output="obj/Debug/" />
+				<Option type="1" />
+				<Option compiler="gcc" />
+				<Compiler>
+					<Add option="-g" />
+				</Compiler>
+			</Target>
+			<Target title="Release">
+				<Option output="bin/Release/cpp43" prefix_auto="1" extension_auto="1" />
+				<Option object_output="obj/Release/" />
+				<Option type="1" />
+				<Option compiler="gcc" />
+				<Compiler>
+					<Add option="-O2" />
+				</Compiler>
+				<Linker>
+					<Add option="-s" />
+				</Linker>
+			</Target>
+		</Build>
+		<Compiler>
+			<Add option="-Wall" />
+			<Add option="-fexceptions" />
+		</Compiler>
+		<Unit filename="main.cpp" />
+		<Extensions />
+	</Project>
+</CodeBlocks_project_file>

cpp/config-test/main.cpp

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+#include <stdio.h>
+
+typedef void(*LP)();//transform a function to a pointer
+
+void dale()
+{
+    printf("cpp43 by dale clack\n");
+}
+
+void config()
+{
+//change content in "config" file
+    char str[57];
+    printf("Input config:");
+    scanf("%s",str);
+    freopen("config","w",stdout);
+    printf("%s",str);
+    fclose(stdout);
+}
+
+void test()
+{
+    char str[57];
+    //Read content in "config" file
+    freopen("config","r",stdin);
+    scanf("%s",str);
+    printf("config:%s\n",str);
+    fclose(stdin);
+}
+
+LP a[]={dale,config,test};
+
+int main(int argc,char *argv[])
+{
+    int x;
+    printf("Input selection:1.change config 2.test\n");
+    scanf("%d",&x);
+    a[x]();
+    return 0;
+}