Compilare: main.cpp: In function 'int main()': main.cpp:27:41: warning: suggest parentheses around assignment used as truth value [-Wparentheses] for(a=A(' '),b=A('\n');r=(a-b*(a/b));a=b,b=r); ^ main.cpp:24:96: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("euclid2.in","r",stdin),freopen("euclid2.out","w",stdout),fread(p,1,M,stdin),t=A('\n'); ^ main.cpp:24:96: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] main.cpp:24:96: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result]