Compilare: user.cpp: In function ‘char nextch()’: user.cpp:12:37: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fin); ^ user.cpp: In function ‘int main()’: user.cpp:61:33: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] update(m[i][j], nrcol, 1, -1); ^