Compilare: main.c: In function 'main': main.c:7:69: warning: implicit declaration of function 'gets' [-Wimplicit-function-declaration] freopen("ordine.in","r",stdin),freopen("ordine.out","w",stdout),gets(s),n=strlen(s); ^~~~ main.c:7:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("ordine.in","r",stdin),freopen("ordine.out","w",stdout),gets(s),n=strlen(s); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:7:36: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("ordine.in","r",stdin),freopen("ordine.out","w",stdout),gets(s),n=strlen(s); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ./cccFwE5z.o: In function `main': main.c:(.text.startup+0x38): warning: the `gets' function is dangerous and should not be used.