Compilare: user.c:5:5: warning: conflicting types for built-in function ‘pow’ [enabled by default] int pow(int a,int n,int p){ ^ user.c: In function ‘main’: user.c:31:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("ackermann.in","r",stdin); ^ user.c:32:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("ackermann.out","w",stdout); ^ user.c:38:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i",&t); ^ user.c:41:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i%i",&a,&b,&p); ^