foo.cc: In function ‘int main()’:
foo.cc:13:3: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wdangling-else]
   13 | if(x%j==0)
      |   ^
foo.cc:6:7: warning: unused variable ‘n1’ [-Wunused-variable]
    6 | int n,n1,a1=1,b1=1,x,m;
      |       ^~
foo.cc:6:10: warning: unused variable ‘a1’ [-Wunused-variable]
    6 | int n,n1,a1=1,b1=1,x,m;
      |          ^~
foo.cc:6:15: warning: unused variable ‘b1’ [-Wunused-variable]
    6 | int n,n1,a1=1,b1=1,x,m;
      |               ^~
foo.cc:25:7: warning: ‘m’ may be used uninitialized [-Wmaybe-uninitialized]
   25 | cout<<m;
      |       ^
foo.cc:6:22: note: ‘m’ was declared here
    6 | int n,n1,a1=1,b1=1,x,m;
      |                      ^