Error in the source code

[GeorgeL]

Hiya everyone,I have a problem with my source code and I just dont know how to fix it ... any suggestions ?

Thanks



#include <iostream>
using namespace std;

const int MAXCOMMANDS = 100, SIZE = 20;

int turnRight( int );
int turnLeft( int );
void getCommands( int [][ 2 ] );
void movePen( int, int [][ SIZE ], int, int );
void printArray( const int [][ SIZE ] );

int main()
{
int floor[ SIZE ][ SIZE ] = { 0 }, command, direction = 0,
commandArray[ MAXCOMMANDS ][ 2 ] = { 0 }, distance, count = 0;
int penDown= 0;
getCommands( commandArray );
command = commandArray[ count ][ 0 ];

while ( command != 9 ) {
switch ( command ) {
case 1:
penDown = 0;
break;
case 2:
penDown = 1;
break;
case 3:
direction = turnRight( direction );
break;
case 4:
direction = turnLeft( direction );
break;
case 5:
distance = commandArray[ count ][ 1 ];
movePen( penDown, floor, direction, distance );
break;
case 6:
cout << "\nThe drawing is:\n\n";
printArray( floor );
break;
}

command = commandArray[ ++count ][ 0 ];
}

return 0;
}

void getCommands( int commands[][ 2 ] )
{
int tempCommand;

cout << "Enter command (9 to end input): ";
cin >> tempCommand;

for ( int i = 0; tempCommand != 9 && i < MAXCOMMANDS; ++i ) {
commands[ i ][ 0 ] = tempCommand;

if ( tempCommand == 5 ) {
cin.ignore(); // skip comma
cin >> commands[ i ][ 1 ];
}

cout << "Enter command (9 to end input): ";
cin >> tempCommand;
}

commands[ i ][ 0 ] = 9; // last command
}

int turnRight( int d )
{
return ++d > 3 ? 0 : d;
}

int turnLeft( int d )
{
return --d < 0 ? 3 : d;
}

void movePen( int down, int a[][ SIZE ], int dir, int dist )
{
static int xPos = 0, yPos = 0;
int j; // looping variable

switch ( dir ) {
case 0: // move to the right
for ( j = 1; j <= dist && yPos + j < SIZE; ++j )
if ( down )
a[ xPos ][ yPos + j ] = 1;

yPos += j - 1;
break;
case 1: // move down
for ( j = 1; j <= dist && xPos + j < SIZE; ++j )
if ( down )
a[ xPos + j ][ yPos ] = 1;

xPos += j - 1;
break;
case 2: // move to the left
for ( j = 1; j <= dist && yPos - j >= 0; ++j )
if ( down )
a[ xPos ][ yPos - j ] = 1;
break;
case 3: // move up
for ( j = 1; j <= dist && xPos - j >= 0; ++j )
if ( down )
a[ xPos - j ][ yPos ] = 1;

xPos -= j - 1;
break;
}
}

void printArray( const int a[][ SIZE ] )
{
for ( int i = 0; i < SIZE; ++i ) {
for ( int j = 0; j < SIZE; ++j )
cout << ( a[ i ][ j ] ? '*' : ' ' );

cout << endl;
}
system ("PAUSE");
}

[magicalblender]

Can you be more specific about your problem? Does it compile? If not, exactly what error messages do you get? If it does compile, does it not run correctly? If so, what do you expect it to do, and what does it actually do?

Can you put your code in code tags next time?

[GeorgeL]

Sorry,the hotlink is not workin so i have to do it like this ... Heres what it says when i compile it : http://img14.imageshack.us/i/54169634.jpg/

#include <iostream>
using namespace std;

const int MAXCOMMANDS = 100, SIZE = 20;

 int turnRight( int );
 int turnLeft( int );
 void getCommands( int [][ 2 ] );
 void movePen( int, int [][ SIZE ], int, int );
 void printArray( const int [][ SIZE ] );

 int main()
 {
 int floor[ SIZE ][ SIZE ] = { 0 }, command, direction = 0,
 commandArray[ MAXCOMMANDS ][ 2 ] = { 0 }, distance, count = 0;
 int penDown= 0;
 getCommands( commandArray );
 command = commandArray[ count ][ 0 ];

 while ( command != 9 ) {
 switch ( command ) {
 case 1:
 penDown = 0;
 break;
 case 2:
 penDown = 1;
 break;
 case 3:
 direction = turnRight( direction );
 break;
 case 4:
 direction = turnLeft( direction );
 break;
 case 5:
 distance = commandArray[ count ][ 1 ];
 movePen( penDown, floor, direction, distance );
 break;
 case 6:
 cout << "\nThe drawing is:\n\n";
 printArray( floor );
 break;
 }

 command = commandArray[ ++count ][ 0 ];
}

 return 0;
 }

 void getCommands( int commands[][ 2 ] )
 {
 int tempCommand;

 cout << "Enter command (9 to end input): ";
 cin >> tempCommand;

 for ( int i = 0; tempCommand != 9 && i < MAXCOMMANDS; ++i ) {
 commands[ i ][ 0 ] = tempCommand;

 if ( tempCommand == 5 ) {
 cin.ignore(); // skip comma
 cin >> commands[ i ][ 1 ];
 }

 cout << "Enter command (9 to end input): ";
 cin >> tempCommand;
 }

 commands[ i ][ 0 ] = 9; // last command
 }

 int turnRight( int d )
 {
 return ++d > 3 ? 0 : d;
 }

 int turnLeft( int d )
 {
 return --d < 0 ? 3 : d;
 }

 void movePen( int down, int a[][ SIZE ], int dir, int dist )
 {
 static int xPos = 0, yPos = 0;
 int j; // looping variable

 switch ( dir ) {
 case 0: // move to the right
 for ( j = 1; j <= dist && yPos + j < SIZE; ++j )
 if ( down )
 a[ xPos ][ yPos + j ] = 1;

 yPos += j - 1;
 break;
 case 1: // move down
 for ( j = 1; j <= dist && xPos + j < SIZE; ++j )
 if ( down )
a[ xPos + j ][ yPos ] = 1;

 xPos += j - 1;
 break;
 case 2: // move to the left
 for ( j = 1; j <= dist && yPos - j >= 0; ++j )
 if ( down )
 a[ xPos ][ yPos - j ] = 1;
break;
 case 3: // move up
 for ( j = 1; j <= dist && xPos - j >= 0; ++j )
 if ( down )
 a[ xPos - j ][ yPos ] = 1;

 xPos -= j - 1;
 break;
 }
 }

 void printArray( const int a[][ SIZE ] )
 {
 for ( int i = 0; i < SIZE; ++i ) {
 for ( int j = 0; j < SIZE; ++j )
 cout << ( a[ i ][ j ] ? '*' : ' ' );

 cout << endl;
 }
 system ("PAUSE");
 }

this should be a turtle graph

[magicalblender]

I don't understand what the errors mean exactly, but the problem is on Line 69:
commands[ i ][ 0 ] = 9; // last command
It appears that "i" doesn't exist in this scope, because you declared it within the parameters of the "for" loop. In other words, you can't do this:

for(int i = 0; i < 10; i++){
 cout << "\n" << "current value of i:" << i;
}
cout << "\n" << "final value of i: " << i;

... If you want "i" to continue to exist, declare it outside of the loop.

int i;
for(i = 0; i < 10; i++){
 cout << "\n" << "current value of i: " << i;
}
cout << "\n" << "final value of i: " << i;

[guestgulkan]

That is what it means.