foo.cc: In function 'int main()':
foo.cc:7:11: warning: unused variable 'x' [-Wunused-variable]
    7 |  int n,n1,x,s=0,d1=1,m,zc=0;
      |           ^
foo.cc:7:17: warning: unused variable 'd1' [-Wunused-variable]
    7 |  int n,n1,x,s=0,d1=1,m,zc=0;
      |                 ^~
foo.cc:7:24: warning: unused variable 'zc' [-Wunused-variable]
    7 |  int n,n1,x,s=0,d1=1,m,zc=0;
      |                        ^~

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