foo.cc: In function 'int add(int, int)':
foo.cc:31:9: warning: 'zonghe' may be used uninitialized in this function [-Wmaybe-uninitialized]
   31 |  return zonghe;
      |         ^~~~~~
foo.cc: In function 'int main()':
foo.cc:28:16: warning: 'zonghe' may be used uninitialized in this function [-Wmaybe-uninitialized]
   28 |   zonghe=zonghe*n+a%n;
      |          ~~~~~~^~
foo.cc:25:6: note: 'zonghe' was declared here
   25 |  int zonghe;
      |      ^~~~~~
foo.cc:48:18: warning: 'cnt' may be used uninitialized in this function [-Wmaybe-uninitialized]
   48 |   cout<<"STEP="<<cnt;
      |                  ^~~

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