Compilare: user.c: In function ‘main’: user.c:4:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("divmul.in","r",stdin),freopen("divmul.out","w",stdout),scanf("%d",&r); ^ user.c:4:40: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("divmul.in","r",stdin),freopen("divmul.out","w",stdout),scanf("%d",&r); ^ user.c:4:71: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("divmul.in","r",stdin),freopen("divmul.out","w",stdout),scanf("%d",&r); ^ user.c:6:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y),t=y/x,k=0; ^