Compilare: user.c: In function ‘main’: user.c:18:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(lg<l) ^ user.c:7:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("ecuatii2.in","r",stdin),freopen("ecuatii2.out","w",stdout),scanf("%d\n",&n); ^ user.c:7:45: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("ecuatii2.in","r",stdin),freopen("ecuatii2.out","w",stdout),scanf("%d\n",&n); ^ user.c:7:78: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("ecuatii2.in","r",stdin),freopen("ecuatii2.out","w",stdout),scanf("%d\n",&n); ^ user.c:9:36: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] x[0]=x[1]=y[0]=y[1]=0,scanf("%s\n",s),l=strlen(s),k=1,strcpy(q,s),r=strtok(s,"+-="),lg=-1,d=0; ^