C++ Errors I get following errors on this code and cannot figure out the problem
ID: 3685617 • Letter: C
Question
C++ Errors
I get following errors on this code and cannot figure out the problem.
I bolded the lines 21 and 22 that the error is occuring.
project3.C: In function `int main()':
project3.C:15: warning: comparison between signed and unsigned
integer expressions
project3.C:21: error: ISO C++ forbids variable-size array `grid'
project3.C:21: error: ISO C++ forbids variable-size array `grid'
project3.C:22: error: ISO C++ forbids variable-size array `gridc'
project3.C:22: error: ISO C++ forbids variable-size array `gridc'
-----------------------------------------------------------------------------------------------------------------------------------------------------
#include
#include
#include
#include
using namespace std;
int main()
{
ifstream file("data.txt");
string a,word[10];
int i=0,l=0;
srand(time(NULL));
while(!file.eof())
{
file>>a;
if(l l=a.length();
word[i++]=a;
}
i--;
int size=l+1; //grid size wil be length of longest word + 1
char grid[size][size];
int gridc[size][size]={0};
for(int x=0;x for(int y=0;y grid[x][y]='0';
//placing the words in the grid word by word
for(int k=0;k {
int length=word[k].length();
int j=rand()%3;
switch(j)
{
//horizontal
case 0:
{
int r=rand()%size; //to find the row to start the word
int c=rand()%(size-length); // this is find the column to start the word
for(int m=0;m {
//if cell is empty then allocate letter
if(grid[r][c]=='0')
grid[r][c++]=word[k][m];
//if the cell contains the same letter of the word already then update gridc to track that letter belongs to some other word also
else if(grid[r][c]==word[k][m])
{
gridc[r][c]=1;
c++;
}
else
{
//to deallocate the allocated letters
for(int n=m;n>=0;n--)
{
if(gridc[r][--c]==0)
grid[r][c]='0';
}
k--; //going back to the same word and processing
break ;
}
}
break;
}
//vertical
case 1:
{
int r=rand()%(size-length); //to find the row to start the word
int c=rand()%size; // this is find the column to start the word
for(int m=0;m {
//if cell is empty then allocate letter
if(grid[r][c]=='0')
grid[r++][c]=word[k][m];
//if the cell contains the same letter of the word already then update gridc to track that letter belongs to some other word also
else if(grid[r][c]==word[k][m])
{
gridc[r][c]=1;
r++;
}
else
{
//to deallocate the allocated letters
for(int n=m;n>=0;n--)
{
if(gridc[--r][c]==0)
grid[r][c]='0';
}
k--;//going back to the same word and processing
break ;
}
}
break;
}
//diagonal
case 2:
{
int r=rand()%(size-length); //to find the row to start the word
int c=rand()%(size-length); // this is find the column to start the word
for(int m=0;m {
//if cell is empty then allocate letter
if(grid[r][c]=='0')
grid[r++][c++]=word[k][m];
//if the cell contains the same letter of the word already then update gridc to track that letter belongs to some other word also
else if(grid[r][c]==word[k][m])
{
gridc[r][c]=1;
r++;
c++;
}
else
{
//to deallocate the allocated letters
for(int n=m;n>=0;n--)
{
if(gridc[--r][--c]==0)
grid[r][c]='0';
}
k--;//going back to the same word and processing
break ;
}
}
break;
}
}
}
//to fill the empty cells with random letters
srand(time(NULL));
for(int x=0;x for(int y=0;y {
if(grid[x][y]=='0')
{
int val=rand()%26;
val+=97;
grid[x][y]=val;
}
}
//to print the grid puzzle
for(int x=0;x {
cout< for(int y=0;y cout<
Explanation / Answer
The error is happening because you are allocating memory statically to array using a variable whose value will be determined at running.
Fix:
Use dynamically allocation of array:
//dynamic allocation
char** grid = new char*[size];
for(int i=0;i<size;i++)
grid[i] = new char[size];
char** gridc = new char*[size];
for(int i=0;i<size;i++)
gridc[i] = new char[size];
//initiallization
gridc[0][0] = 0;
//freeing up memory written at the end of program
for(int i=0;i<size;i++)
{
delete grid[i];
delete gridc[i];
}
delete grid;
delete gridc;
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