Compilare: main.cpp: In function 'int main()': main.cpp:9:18: warning: suggest parentheses around assignment used as truth value [-Wparentheses] for(;r=a%b;a=b,b=r); ^ main.cpp:5:85: 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),scanf("%d",&t); ^ main.cpp:5:85: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] main.cpp:5:85: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] main.cpp:8:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^