s1=<> s1=<> s2= s2= s3= s3= s3.length()=5 s3.length()=5 s3.size()=5 s3.size()=5 s3.max_size()=8 s3.max_size()=8 s3.capacity()=8 s3.capacity()=8 s2= s2= s3= s3= buf= buf= buf= buf= s3.c_str()= s3.c_str()= s2.data()= s2.data()= s2.capacity()=8 s2.capacity()=8 s2.data()= s2.data()= s2.capacity()=64 s2.capacity()=64 s2.empty()=0 s2.empty()=0 s2.c_str()=<> s2.c_str()=<> s2.empty()=1 s2.empty()=1 s2.data()= s2.data()= s2.data()= s2.data()= p points to a p points to a s2= s2= p points to b p points to b s2= s2= s2[2]=a s2[2]=a s2.at(2)=a s2.at(2)=a s2[2]=a s2[2]=a s2.at(2)=a s2.at(2)=a s2= s2= s2= s2= s2.substr(1,5)= s2.substr(1,5)= s2.substr(5)= s2.substr(5)=