global and local variables

c-basic/global_local.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+int a;
+
+void foo()
+{
+  int a;
+
+  a = 10; 
+}
+
+int main()
+{
+  a = 20; 
+
+  printf("%d\n", a); 
+  foo();
+  printf("%d\n", a);
+
+  return 0;
+}