submatrix.cpp: In function `int main()': submatrix.cpp:8: warning: `int l1m' might be used uninitialized in this function submatrix.cpp:8: warning: `int l2m' might be used uninitialized in this function submatrix.cpp:8: warning: `int c1m' might be used uninitialized in this function submatrix.cpp:8: warning: `int c2m' might be used uninitialized in this function /tmp/ccyE2hfi.o(.text+0x76): In function `main': : the `gets' function is dangerous and should not be used.