/in/foo.cc: In function 'int main()':
/in/foo.cc:9:16: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
    9 |   for(int j=0;j<strlen(a);j++)
      |               ~^~~~~~~~~~
/in/foo.cc:12:8: warning: array subscript 100 is above array bounds of 'char [100]' [-Warray-bounds]
   12 |   a[100]={};
      |   ~~~~~^
/in/foo.cc:6:6: note: while referencing 'a'
    6 | char a[100]={};
      |      ^