Pointer Pointer

Well i like to share some code that i worked on, for a school. It goal was to show the power of pointers.

 

  1: #include <string.h>
  2: #include <stdio.h>
  3: #include <stdlib.h>
  4: #include <ctype.h>
  5: #include <windows.h>
  6: #include <conio.h>
  7: #include <iostream>
  8: #define LOCATE(r, c) GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbiInfo);csbiInfo.dwCursorPosition.X = c;csbiInfo.dwCursorPosition.Y = r; SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), csbiInfo.dwCursorPosition);
  9: 
 10: //Used to chnage console collors in windows
 11: CONSOLE_SCREEN_BUFFER_INFO csbiInfo;
 12: HANDLE hStdin = GetStdHandle(STD_INPUT_HANDLE); 
 13: HANDLE hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
 14: 
 15: using namespace std;
 16: 
 17: void paintScreen(int years), moveData(int *loca, char *buffer, float **table), moveLoc(int *loc, int year, char dir), viewTable(float **table, int *year);
 18: double findTotal(float **, int);
 19: void printCollumTotal(float **table, int *year);
 20: double findCollumTotal(float *table, int *year);
 21: float **dArray( int nRows, int nCols);
 22: 
 23: 
 24: int main()
 25: {
 26:     int loc[] = {0,0}, year = 0, i=0; //loc is the x,y loc on table, year numver of rows, i index in buffer
 27:     bool breakVar = 0; //used to brak to the outer while loop, on halt
 28:     unsigned char c;//input char 0-256
 29:     static char charBuffer[11];//buffer for imput string
 30: 
 31:     system("CLS");
 32:     puts("How many years do you want to enter? ");
 33:     scanf("%i",&year);
 34:     float **ppTable = dArray(year, 5); //makes the array/table
 35:     
 36:     paintScreen(year);
 37:     
 38:     while(!breakVar)
 39:     {
 40:         i=0;
 41:         charBuffer[0] = '\0';
 42:         while(!((c=getch()) == 9 || c == 13 || c == 224 || c == 'Q' || c == 'P' || c == 'V'))
 43:         {
 44:             if(*(loc + 1) == 0)
 45:             {
 46:                 if(c>='0' && c <= '9')
 47:                 {
 48:                     charBuffer[i++]=c;
 49:                     putch(c);
 50:                     if(i == 4)
 51:                     {
 52:                         charBuffer[i]='\0';
 53:                         moveData(loc,charBuffer,ppTable);
 54:                         moveLoc(loc,year,'R');
 55:                         i=0;
 56:                         break;
 57:                     }
 58:                 }
 59:             }
 60:             else
 61:             {
 62:                 if(c>='0' && c <= '9' || c == '.')
 63:                 {
 64:                     charBuffer[i++]=c;
 65:                     putch(c);
 66:                     if(i == 10)
 67:                     {
 68:                         charBuffer[i]='\0';
 69:                         moveData(loc,charBuffer,ppTable);
 70:                         printCollumTotal(ppTable,&year);
 71:                         moveLoc(loc,year,'R');
 72:                         i = 0;
 73:                         break;
 74:                     }
 75:                 }    
 76:             }
 77: 
 78:             if(c==8)
 79:             {
 80:                 putchar(8);
 81:                 i--;
 82:             }
 83:         }
 84:         if(c == 9)
 85:         {
 86:             charBuffer[i]='\0';
 87:             moveData(loc,charBuffer,ppTable);
 88:             printCollumTotal(ppTable,&year);
 89:             moveLoc(loc,year,'R');
 90:         }
 91:         else if(c == 13)
 92:         {
 93:             charBuffer[i]='\0';
 94:             moveData(loc,charBuffer,ppTable);
 95:             printCollumTotal(ppTable,&year);
 96:             moveLoc(loc,year,'D');
 97:         }
 98:         else if(c == 224)
 99:         {
100:             c = getch();
101:             if(c == 72)//up arrow
102:             {
103:                 charBuffer[i]='\0';
104:                 moveData(loc,charBuffer,ppTable);
105:                 printCollumTotal(ppTable,&year);
106:                 moveLoc(loc,year,'U');
107:             }
108:             else if(c == 75)//left
109:             {
110:                 charBuffer[i]='\0';
111:                 moveData(loc,charBuffer,ppTable);
112:                 printCollumTotal(ppTable,&year);
113:                 moveLoc(loc,year,'L');
114:             }
115:             else if(c == 80)//down
116:             {
117:                 charBuffer[i]='\0';
118:                 moveData(loc,charBuffer,ppTable);
119:                 printCollumTotal(ppTable,&year);
120:                 moveLoc(loc,year,'D');
121:             }
122:             else if(c == 77)//right
123:             {
124:                 charBuffer[i]='\0';
125:                 moveData(loc,charBuffer,ppTable);
126:                 printCollumTotal(ppTable,&year);
127:                 moveLoc(loc,year,'R');
128:             }
129:         }
130:         else if(c == 'Q')
131:         {    
132:             breakVar = 1;
133:             continue;
134:         }
135:         else if(c == 'V')
136:         {
137:             viewTable(ppTable,&year);
138:             breakVar = 1;
139:             continue;
140:         }
141:         else if(c == 'P')
142:         {
143:             breakVar = 1;
144:             continue;
145:         }
146: 
147:     }
148:         
149:     delete [] *ppTable;
150:     delete [] ppTable;
151:     return 1;
152: }
153: 
154: float **dArray( int nRows, int nCols)
155: {
156:     float **ppi;
157:     float *pool;
158:     float *curPtr;
159:     //(step 1) allocate memory for array of elements of column
160: 
161:     ppi = new float*[nRows];
162: 
163:     //(step 2) allocate memory for array of elements of each row
164:     pool = new float [nRows * nCols];
165: 
166:     // Now point the pointers in the right place
167:     curPtr = pool;
168:     for( int i = 0; i < nRows; i++)
169:     {
170:         *(ppi + i) = curPtr;
171:          curPtr += nCols;
172:     }
173:     for( int i = 0; i < nRows; i++)
174:     {
175:         for(int j=0;j <nCols; j++)
176:         {
177:             *(*(ppi + i)+j) = 0;
178:         }
179:     }
180:     
181:     return ppi;
182: }
183: 
184: void paintScreen(int years)
185: {
186:     system("CLS");
187:     LOCATE(2,28);
188:     puts("Data Entry Forum");
189:     LOCATE(5,0);
190:     puts("YEAR");
191:     LOCATE(5,13);
192:     puts("QUARTER 1");
193:     LOCATE(5,32);
194:     puts("QUARTER 2");
195:     LOCATE(5,51);
196:     puts("QUARTER 3");
197:     LOCATE(5,70);
198:     puts("QUARTER 4");
199:     for(int i = 6; i < years + 8; i++)
200:     {
201:         for(int j = 12; j<70; j+=19)
202:         {
203:             LOCATE(i,j);
204:             if(i == years + 7)
205:             {
206:                 puts("|");
207:             }
208:             else
209:             {
210:                 puts("$");
211:             }
212:         }
213:     }
214:     LOCATE(6 + years,0);
215:     for(int i = 0; i < 80; i++)
216:     {
217:         putch('-');
218:     }
219:     LOCATE(7 + years,0);
220:     puts("TOTAL:");
221:     LOCATE(9 + years,0);
222:     puts("Press Q at any time to Quit, V to view data reports, P to print");
223:     LOCATE(6,0);
224: }
225: void moveData(int *loc, char *buffer, float **table)
226: {
227:     if(strlen(buffer)!=0) //checks if it is already empty
228:     {
229:         *(*(table + *loc) + *(loc + 1)) = atof(buffer); //wont wipe out old data, if empty
230:         strcpy(buffer,"");
231:     }
232: }
233: void moveLoc(int *loc, int year, char dir)
234: {
235:     if(dir == 'U')
236:     {
237:         if(*loc > 0)
238:         {
239:             *loc = *loc - 1;
240:         }
241: 
242:     }
243:     else if(dir == 'R')
244:     {
245:         if(*(loc + 1) > 4)
246:         {
247:             *(loc + 1) = 0;
248:             *loc = *loc + 1;
249:         }
250:         else
251:         {
252:             *(loc + 1) = *(loc + 1) + 1;
253:         }
254:     }
255:     else if(dir == 'D')
256:     {
257:         if(*loc < year - 1)
258:         {
259:             *loc = *loc + 1;
260:         }
261:     }
262:     else if(dir == 'L')
263:     {
264:         if(*(loc + 1) > 0)
265:         {
266:             *(loc + 1) = *(loc + 1) - 1;
267:         }
268:     }
269:     
270:     if(*(loc + 1)== 1)
271:     {
272:         LOCATE(6 + *loc,13);
273:     }
274:     else if(*(loc + 1)== 0)
275:     {
276:         LOCATE(6 + *loc,0);
277:     }
278:     else
279:     {
280:         LOCATE(6 + *loc,*(loc + 1)*19 - 6);
281:     }
282: }
283: double findTotal(float *aArray, int aNum)
284: {
285:     double total = 0;
286:     for(int i=1; i <= aNum; i++)
287:     {
288:         total += *(aArray + i);
289:     }
290:     return total;
291: }
292: double findCollumTotal(float *table, int *year)
293: {
294:     double total = 0;
295:     for(int i = 0; i < *year; i++)
296:     {
297:         total += *(table + 5 * i);
298:     }
299:     return total;
300: }
301: void viewTable(float **table, int *year)
302: {
303:     double grandTotal = 0;
304:     system("CLS");
305:     puts("YEAR\tQ1\t\tQ2\t\tQ3\t\tQ4\t\tTOTAL");
306:     for(int i = 0; i < *year; i++)
307:     {
308:         printf("%-4.0f\t",*(*(table + i)));
309:         for(int j = 1; j < 6; j++)
310:         {
311:             if(j==5)
312:             {
313:                 grandTotal+=findTotal(*(table + i),4);
314:                 printf("%-10.2f\t",findTotal(*(table + i),4));
315:             }
316:             else
317:             {
318:                 printf("%-10.2f\t",*(*(table + i) + j));
319:             }
320:         }
321:         printf("\n\r");
322:     }
323:     printf("\n\rTOTAL\t");
324:     for(int j = 1; j<=5; j++)
325:     {
326:         {
327:             if(j==5)
328:             {
329:                 printf("%-10.2f",grandTotal);
330:             }
331:             else
332:             {
333:                 printf("%-10.2f\t",findCollumTotal(*table + j,year));
334:             }
335:         }
336:     }
337:     printf("\n\rAVERAGE\t");
338:     for(int j = 1; j<5; j++)
339:     {
340:         {
341:             printf("%-10.2f\t",(findCollumTotal(*table + j,year)/(*year)));
342:         }
343:     }
344:     printf("\n\r");
345:     printf("\n\rYearly AVERAGE: %-10.2f\n\r", grandTotal/(*year));
346:     system("Pause");
347: }
348: void printCollumTotal(float **table, int *year)
349: {
350:     LOCATE(*year +7,13)
351:     for(int i = 0; i <67; i++)
352:     {
353:         printf(" ");
354:     }
355:     for(int j = 0; j<4; j++)
356:     {
357:         LOCATE(*year + 7,j*19+12);
358:         {
359:             printf("|%-10.2f",findCollumTotal(*table + (j+1),year));
360:         }
361:     }
362: }

LOL

I'm watching HSN, home shoping networking, and they are selling gateway. And they advertize 800 dollar worth softwear. Some of the titles they list is mozilas packedged thuderbord and firfox, both free opensource softwear. Just thought it was funny, nice compute though for hsn

IP To MAC or is it MAC To IP?

Neither!

I was reading an artical on /. (http://news.slashdot.org/article.pl?sid=08/08/06/0224238) and it makes me wonder what are they thinking. Tufts University's is totaly right that it in imposiable to cross-match IP addresses to MAC addresses to idetifi users. REason one theey gave the system uses DHCP therfeore ip are randomly and dynamicly assigned to the computer. Secoundly even if you indtifed the computer, it does not help since computers can be shared fore you can not indtifi the user. Another reason which they did not give, is MAC adresses are spoofable, thefore once again it hard to 100% confirm a IP to a computer. For example if you wanted to be a complete jerk, Scan the network for other clients, (easy) copy there mac addresses, wait for them to discountect, or force them to discount, change your MAC adresses to the one you copy, connect to network, do what needs to be done, discounted and chnage your MAC to manufacture default was.

Yea, .... Ok?

Like always I have been busy. Last week of school is coming to end. That's the "Yea" part. So what now? What are my planes for the rest of the summer, you ask?  I don't know where to begin. I have a such long to do list, i don't know where i should start or how to priorities them. So to name a few in no particular order:

Gateway: My goal it to turn a old beige PC into a local gateway/firewall/AV for my home network. The plain is to have it running virtually on my old server. The only thing i'm waiting for it to come by a gibite Ethernet card.

Beowulf Cluster: This is something i been wanting to do for a few years, but don't have the money to fund it. I'm thinking about asking office buildings and public schools if they are willing to donate about 6 of there obsoltete computers. I still would need a Switch or a hub to connect them all. Switch can be pricey, and not something people are willing to throw away. I don't know if i want the nodes to be thin client/Dumb computer without hard drives. I think it will be cooler to have the nodes to be dumb and only processes task the server sends to them.

Microcontrolls, This is something i just got interested in. First i wanted to make DAQ (data acquisition) to stream data from a load cell to my computer. Secondly i was thing about making an on board computer for a model rocket that will record altitude, acceleration, and time. It also would be able deploy parachutes. I also was thinking about adding a transceiver.



Multi Touch Display. I found a good link to a walk though on how to build your own multi touch screen along with the software necessary to get everything up in running.


Linux : I need to get Linux working back on my laptop. This is something simple and should not take to long. Th hard part/ time consuming part is backing up the data before hand. I also plan to install TrueCrypt.


On the bright side i just finshed, working on a website. So acpect to see a little JavaScript example soon.

Mozilla Labs

Here is a cool concept videio from thr Mozilla guys


Aurora (Part 1) from Adaptive Path on Vimeo.

I will be make some more post soon, so stand by