Compilare: user.cpp: In function ‘int main()’: user.cpp:16:24: warning: suggest parentheses around assignment used as truth value [-Wparentheses] while(r=i%j) ^ user.cpp:6:19: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:6:19: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:6:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:8:88: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d",&a,&b,&e,&f,&g,&h),i=(e<g?(g-e):(e-g)),j=(f<h?(h-f):(f-h)); ^