Compilare: user.c: In function ‘main’: user.c:81:5: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘char (*)[204]’ [-Wformat=] freopen("free.in","r",stdin),freopen("free.out","w",stdout),scanf("%s",&s),n=strlen(s); ^ user.c:81:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("free.in","r",stdin),freopen("free.out","w",stdout),scanf("%s",&s),n=strlen(s); ^ user.c:81:41: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("free.in","r",stdin),freopen("free.out","w",stdout),scanf("%s",&s),n=strlen(s); ^ user.c:81:70: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("free.in","r",stdin),freopen("free.out","w",stdout),scanf("%s",&s),n=strlen(s); ^ user.c: In function ‘div2’: user.c:72:6: warning: ‘b[1]’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(!b[1]) ^