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    <p>Your matrices are too big for the stack on your machine. Each of the arrays has 4 million integers, or roughly 16 MiB of storage; that is a very big stack requirement.</p> <p>Either reduce their size or allocate them dynamically.</p> <p>Or (as noted in the comments), make them into variables with 'static duration', either within <code>main</code> with the keyword <code>static</code> in front:</p> <pre><code>int main(int argc, char *argv[]) { int row1, row2, col1, col2, i, j, cnt=0; static int mat1[2000][2000], mat2[2000][2000]; </code></pre> <p>or as file scope variables defined outside <code>main()</code>, also with the keyword <code>static</code> in front:</p> <pre><code>static int mat1[2000][2000], mat2[2000][2000]; int main(int argc, char *argv[]) { int row1, row2, col1, col2, i, j, cnt=0; </code></pre> <p>or as global variables defined outside <code>main()</code> without the keyword <code>static</code> (but only do this if you will have multiple source files that need to access them by name):</p> <pre><code>int mat1[2000][2000], mat2[2000][2000]; int main(int argc, char *argv[]) { int row1, row2, col1, col2, i, j, cnt=0; </code></pre> <p>You could also (again, as noted in the comments) increase the stack size. However, I respectfully suggest that is probably the least satisfactory solution.</p> <blockquote> <p>How to dynamically allocate the size of an array?</p> </blockquote> <p>Fair question. How often do you think you'll really need a pair of 4 million cell arrays, compared with how often will you be dealing with, say, under 100x100 arrays? Also, are you on Windows (with MSVC and C89) or non-Windows (with C99 or later), or on Windows with GCC?</p> <p>Also, have you learned about pointers yet?</p> <p>On the whole, I think you should opt for smaller size arrays. That is by far the simplest solution. If you must have big arrays, go with statically allocated arrays.</p> <p>If that won't work, we'll have to go through the pointers, but it isn't pretty.</p>
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    1. CO..or make them `static`.
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    2. CO...or increase the stack size.
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    3. COhow to dynamically allocate the size of an array?
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