Compilare: user.c: In function ‘main’: user.c:3:134: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] int main() { fscanf(fopen("triplet.in","r"),"%d",&n),fprintf(fopen("triplet.out","w"),"%d %d %d",n&1?(n-n/2):n/2,n&1?(-n/2):(1-n/2),1-n&1); } ^ user.c:3:20: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] int main() { fscanf(fopen("triplet.in","r"),"%d",&n),fprintf(fopen("triplet.out","w"),"%d %d %d",n&1?(n-n/2):n/2,n&1?(-n/2):(1-n/2),1-n&1); } ^