Compilare: main.c: In function 'main': main.c:7:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("paralelograme.in","r",stdin),freopen("paralelograme.out","w",stdout),scanf("%d%d",&n,&m),l=n<m?m:n; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:7:43: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("paralelograme.in","r",stdin),freopen("paralelograme.out","w",stdout),scanf("%d%d",&n,&m),l=n<m?m:n; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:7:83: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("paralelograme.in","r",stdin),freopen("paralelograme.out","w",stdout),scanf("%d%d",&n,&m),l=n<m?m:n; ^~~~~~~~~~~~~~~~~~~