Compilare: user.cpp: In function ‘int main()’: user.cpp:65:52: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &nrlin, &nrcol, &k, &e); ^ user.cpp: In function ‘char nextch()’: user.cpp:12:63: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (pos == BUF_SIZE) fread(buf, BUF_SIZE, 1, fin), pos = 0; ^