Run-time check failure #2

[Phule99]

I have a program for my C++ class. I'm pretty sure i've done it correctly but i get a Tun-Time Check Failure #2 - Stack around the variable 'totalarray' was corrupted. Here is my project and program.

Create a flowchart and write a complete C++ program that declares a 2 dimensional integer array of size 10 rows and 10 columns. The program should use two nested for loops to fill the array as follows. If the row number is divisible by the column number then put the row number in the cell, otherwise put the column number in the cell. The program should then use nested for loops to print the array in table form to the screen.

I don't get an error message if I change array size to totalarray[11][11]
any help would be appreciated. Thanks

#include <iostream>
using namespace std;

int main ()
{
int sum;
int totalarray [10][10];

for (int r=1; r<=10; r++){
for (int c=1; c<=10; c++){
sum=r/c;

if (sum<1)
totalarray[r][c]=c;
else
totalarray[r][c]=r;

cout<<totalarray[r][c]<<" ";


}

cout<<endl;
}

return 0;
}

[Branflakes91093]

Arrays are zero-based, meaning that the first object in totalarray starts at totalarray[0] and the last is at totalarray[9].

You are trying to write/read totalarray[10], which is not part of the array.

Because of this, for loops often start at 0 and end when it reaches the size of the array.

[Phule99]

I figured it out. I knew arrays started at 0 but I assumed that the first number you put in would go to that position. It would if my count started at 0 but it doesn't, it starts at one. So buy changing the the array to totalarray[r-1][c-1] it works. I also didn't have another nested loop to cout my array.

This is the fixed version.

#include <iostream>
using namespace std;

int main ()
{
int sum;
int totalarray [10][10];

for (int r=1; r<=10; r++){
for (int c=1; c<=10; c++){
sum=r/c;

if (sum<1)
totalarray[r-1][c-1]=c;
else
totalarray[r-1][c-1]=r;

}

}
for (int r=0; r<10; r++){
for (int c=0; c<10; c++){
cout<<totalarray[r][c]<<" ";
}
cout<<endl;

}
return 0;
}

[poonsuaza]

your final print out will be
12345678910
22345678910
33345678910
44445678910
55555678910
66666678910
77777778910
88888888910
99999999910
10101010101010101010

I don't understand " if the row number is divisible by the column number then put the row number in the cell" please explain

[Phule99]

All the numbers entering the array are row and column numbers. The row being divisible by the column is what determines what number goes into the array.

Starting with the 1 going diagonally down to 10, these numbers and all those below are all row numbers. The numbers above this diagonal line are all column numbers.

This was class homework to input variables and take them out of an array.

[cire]

All the numbers entering the array are row and column numbers. The row being divisible by the column is what determines what number goes into the array.

No, that isn't what determines what number goes into the array. For your implementation, the number is determined by whether the column will go into the row at least one time.

All row numbers are divisible by column numbers if you begin the numbering with 1.

I would've interpreted the instructions to mean "evenly divisible", which would result in different output.