Im a newbie and need to know how to fill a 2d array from a file of integers. This code doesn't seem to work:
#include<iostream.h>
#include<fstream.h>
#define in_file "array.dat"
int a[5][5];
int main()
for(int i=0;i<5;i++)
for (int j=0;j<5;j++)
ins >> a;
ins >> a[i][j];
Thanks it worked. But the problem is now that I can read the array in , I have to make a program to check if it is symmetric, upper triangle or diagonal.
Im reading this from the array.dat file:
0 1 2 3 4
1 5 6 7 11
2 6 8 9 12
3 7 9 10 13
4 11 12 13 14
When i run the program it should output symmetric is 1(true) but it doesn't work. Here's my code.. any ideas?
//3 Void functions to check whether a 2 dimensional array falls under the special classes
// of symmetric, upper triangle, or diagonal.
#include<iostream.h>
#include<fstream.h>
#define in_file "array.dat"
void checkuppertriangle(int array[5][5], int& result);
void checksymmetric(int array[5][5], int& result);
void checkdiagonal(int array[5][5], int& result);
int a[5][5];
int main()
{
ifstream ins;
ins.open(in_file);
for(int i=0;i<5;i++) //sets the loop to fill the array from a file
for (int j=0;j<5;j++)
ins >> a[i][j];
int triangle,symmetric,diagonal; //variables to output results
checkuppertriangle(a,triangle); //call function
checksymmetric(a,symmetric); //call function
checkdiagonal(a,diagonal); //call function
cout << "Results"
<< "Upper Triangle " << triangle << endl
<< "Symmetric " << symmetric << endl
<< "Diagonal " << diagonal << endl;
int wait;
cin >> wait;
return 0;
}
void checkuppertriangle(int array[5][5], int& result)
{
for(int i=0;i<5;i++) //sets the loop to go through each cell in array
for (int j=0;j<5;j++)
{
if (i > j)
{
result = 0; //passing back the result using a reference
return; //result set to 0 if not symmetric return to
}
else if ((i < j) && (a[i,j]==0))
{
result=1; //set result to 1, continue to check. If all are
}
}
return;
}
void checksymmetric(int array[5][5], int& result)
{
for(int i=0;i<5;i++) //sets the loop to go through each cell in array
for (int j=0;j<5;j++)
{
if ((a[i,j])!=(a[j,i]))
{
result = 0; //passing back the result using a reference
return; //result set to 0 if not symmetric return to
}
else if ((a[i,j])==(a[j,i]))
{
result=1; //set result to 1, continue to check. If all are
}
}
return;
}
void checkdiagonal(int array[5][5], int& result)
{
for(int i=0;i<5;i++) //sets the loop to go through each cell in array
for (int j=0;j<5;j++)
{
if ((a[i,j]!=0) || (i>j))
{
result = 0; //passing back the result using a reference
return; //result set to 0 if not diagonal return to main.
}
else if ((a[i,j]==0)&& (i<j))
{
result=1; //set result to 1, continue to check. If all are
}
}
return;
}
Ok i seemed to figure out the problem. Accessing arrays as
"a[i,j]" was wrong it should be "a[i][j]..."
