foo.cc: In function 'int main()':
foo.cc:26:6: warning: unused variable 'i' [-Wunused-variable]
  int i,j,k,x,y;
      ^
foo.cc:26:12: warning: unused variable 'x' [-Wunused-variable]
  int i,j,k,x,y;
            ^
foo.cc:26:14: warning: unused variable 'y' [-Wunused-variable]
  int i,j,k,x,y;
              ^
foo.cc:30:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s",c);
   ~~~~~^~~~~~~~
foo.cc:31:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld",&j);
   ~~~~~^~~~~~~~~~~
foo.cc:36:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%lld",&k);
    ~~~~~^~~~~~~~~~~

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