Compilare: user.cpp: In function ‘int main()’: user.cpp:28:19: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int n1,n2,j=0,ok,i,c,s,s2,x,y=0,r; ^ user.cpp:28:26: warning: unused variable ‘s’ [-Wunused-variable] int n1,n2,j=0,ok,i,c,s,s2,x,y=0,r; ^ user.cpp:28:28: warning: unused variable ‘s2’ [-Wunused-variable] int n1,n2,j=0,ok,i,c,s,s2,x,y=0,r; ^ user.cpp:28:31: warning: unused variable ‘x’ [-Wunused-variable] int n1,n2,j=0,ok,i,c,s,s2,x,y=0,r; ^ user.cpp:28:37: warning: unused variable ‘r’ [-Wunused-variable] int n1,n2,j=0,ok,i,c,s,s2,x,y=0,r; ^ user.cpp:29:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n1,&n2); ^ user.cpp:33:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&a[i]); ^ user.cpp:38:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&a[++j]); ^