Four sides of square: Difference between revisions
C++ implementation
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1 0 0 0 0 0 0 0 0 0 1
1 1 1 1 1 1 1 1 1 1 1
</pre>
=={{header|C++}}==
<lang cpp>#include <concepts>
#include <iostream>
// Print each element of a matrix according to a predicate. It
// will print a '1' if the predicate function is true, otherwise '0'.
void PrintMatrix(std::predicate<int, int, int> auto f, int size)
{
for(int y = 0; y < size; y++)
{
for(int x = 0; x < size; x++)
{
std::cout << " " << f(x, y, size);
}
std::cout << "\n";
}
std::cout << "\n";
}
int main()
{
// a lambda to show the sides
auto fourSides = [](int x, int y, int size)
{
return x == 0 || (y == 0) || (x == size - 1) || (y == size - 1);
};
PrintMatrix(fourSides, 8);
PrintMatrix(fourSides, 9);
}
</lang>
{{out}}
<pre> 1 1 1 1 1 1 1 1
1 0 0 0 0 0 0 1
1 0 0 0 0 0 0 1
1 0 0 0 0 0 0 1
1 0 0 0 0 0 0 1
1 0 0 0 0 0 0 1
1 0 0 0 0 0 0 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1
1 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 1
1 1 1 1 1 1 1 1 1
</pre>
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