Compilare: user.c:1:18: warning: extra tokens at end of #include directive [enabled by default] #include<stdio.h>#define C adunare ^ user.c: In function ‘main’: user.c:2:27: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] int main(){int a,b;freopen("C.in","r",stdin);freopen("C.out","w",stdout);scanf("%d%d",&a,&b);printf("%d",a+b);return 0;} ^ user.c:2:53: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] int main(){int a,b;freopen("C.in","r",stdin);freopen("C.out","w",stdout);scanf("%d%d",&a,&b);printf("%d",a+b);return 0;} ^ user.c:2:79: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] int main(){int a,b;freopen("C.in","r",stdin);freopen("C.out","w",stdout);scanf("%d%d",&a,&b);printf("%d",a+b);return 0;} ^