foo.cc: In function 'int main()':
foo.cc:39:17: error: 'fabs' was not declared in this scope
             if (fabs(*(s1 + l)-*(s2 + tmp + l))==0|| fabs(*(s1 + l) - *(s2 + tmp + l))=='A'-'a')
                 ^~~~
foo.cc:39:17: note: suggested alternative: 'labs'
             if (fabs(*(s1 + l)-*(s2 + tmp + l))==0|| fabs(*(s1 + l) - *(s2 + tmp + l))=='A'-'a')
                 ^~~~
                 labs

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