Compilare: main.cpp: In function 'int main()': main.cpp:19:26: warning: suggest parentheses around assignment used as truth value [-Wparentheses] for(a=A(),b=A();r=a%b;a=b,b=r); ^ main.cpp:19:6: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(a=A(),b=A();r=a%b;a=b,b=r); ^~~ main.cpp:20:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for(j=0;b;b/=10,j++) ^~~ main.cpp:16:92: 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(); ^ main.cpp:16:92: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] main.cpp:16:92: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] main.cpp:26:8: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized] fwrite(p,1,k,stdout); ~~~~~~^~~~~~~~~~~~~~