Compilare: user.c: In function ‘main’: user.c:9:3: warning: format ‘%hhd’ expects argument of type ‘signed char *’, but argument 3 has type ‘int’ [-Wformat=] fscanf(f,"%hhd",x); ^ user.c:6:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.c:9:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%hhd",x); ^ user.c:10:7: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(x==')' && r==0){x='(';l++;} ^