Compilare: main.cpp: In function 'int main()': main.cpp:21:12: warning: suggest parentheses around assignment used as truth value [-Wparentheses] for(;r=c%d;c=d,d=r); ^ main.cpp:9:92: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("holiday.in","r",stdin),freopen("holiday.out","w",stdout),scanf("%d%d%d",&a,&b,&c); ^ main.cpp:9:92: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] main.cpp:9:92: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]