Compilare: user.c:3:9: warning: return type defaults to ‘int’ [enabled by default] int a,b;main(){fscanf(fn("adunare.in","r"),"%d%d",&a,&b);fprintf(fn("adunare.out","w"),"%d",a+b);} ^ user.c: In function ‘main’: user.c:3:22: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] int a,b;main(){fscanf(fn("adunare.in","r"),"%d%d",&a,&b);fprintf(fn("adunare.out","w"),"%d",a+b);} ^