Compilare: main.cpp: In function 'void mo()': main.cpp:134:21: warning: variable 'sum' set but not used [-Wunused-but-set-variable] int curst,curdr,sum; ^~~ main.cpp: In function 'char read_ch()': main.cpp:36:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(_in_buff, 1, 4096, _fin); ^ main.cpp: In function 'int main()': main.cpp:175:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("deletegcd.out","w",stdout); ^