initial checkin from subversion

xto10.c

@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <math.h>
+#include <stdlib.h>
+
+unsigned long base10;
+int oldbase;
+char c[100];
+unsigned long rest,erg;
+int pos=0;
+int i;
+
+int main()
+{
+ base10=0;
+ oldbase=36;
+ for(i=0;i<100;c[i++]=0);
+ 
+ printf("Altes Zahlensystem:");
+ scanf("%d",&oldbase);
+
+ printf("Zahl im %der-System:",oldbase);
+ scanf("%s",&c);
+ pos=0;
+ while(c[pos++]);
+ pos--;
+ int len=pos-1;
+ while(pos--)
+ {
+  if(isdigit(c[len-pos]))
+  {
+   base10 = base10 + (unsigned long)( (double)(c[len-pos]-'0') * ( pow( (double)oldbase,(double)pos ) ) ) ;
+  printf("-N-DEBUG: base10:%d, c:%c, pos:%d\n",base10,c[pos],pos);
+  }
+  else
+  {
+   base10 = base10 + (unsigned long)( ((double)(c[len-pos]-'A')+10) * ( pow( (double)oldbase,(double)pos ) ) );
+  printf("-A-DEBUG: base10:%d, c:%c, pos:%d\n",base10,c[pos],pos);
+  }
+ }
+ printf("Zahl im 10er-system:%d\n",base10);
+}