Compilare: main.c: In function 'main': main.c:6:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("par.in","r",stdin),freopen("par.out","w",stdout),scanf("%d\n",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:33: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("par.in","r",stdin),freopen("par.out","w",stdout),scanf("%d\n",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:63: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("par.in","r",stdin),freopen("par.out","w",stdout),scanf("%d\n",&n); ^~~~~~~~~~~~~~~~ main.c:8:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^~~~~~~~~~~~~~