Compilare: user.cpp: In function ‘int main()’: user.cpp:41:29: warning: unused variable ‘bx’ [-Wunused-variable] int n, m, x, y, mf, fr, bx, by, imf, ifr, sqr; ^ user.cpp:41:33: warning: unused variable ‘by’ [-Wunused-variable] int n, m, x, y, mf, fr, bx, by, imf, ifr, sqr; ^ user.cpp: In function ‘char nextch()’: user.cpp:23:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(pacm, 1, BMAX, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:39:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rangemode.in", "r", stdin); ^ user.cpp:40:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rangemode.out", "w", stdout); ^ user.cpp:41:37: warning: ‘imf’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n, m, x, y, mf, fr, bx, by, imf, ifr, sqr; ^