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Relational operators with
It's clear that expressions like
a > 5 when
a is an
double are unambiguous both to human eyes and to the compiler. We can also use these relational operators to compare the
string datatype as well, although it's not immediately clear what makes one
string greater than or less than another. However, in C++ the behavior of relational operators on
strings is well defined.
s2 both be
strings, then for any expression involving a relational operator the
strings are evaluated left-to-right,
char, examining the ASCII value of each
char. If all
chars in one
string are at the beginning of the other
string, they are not equal, but the shorter
string is defined to be less than the longer
if ( "Test" == "test" ) // false: 'T' and 't' are different chars if ( "Test" < "test") // true: 'T' is ASCII code 84, 't' is ASCII code 116 if ( "Test" >= "Testing" ) // false: "Test" exactly matches the first 4 chars of "Testing", // so the shorter string is considered less than the longer one if ( "Test" > "Tess") // false: The first three characters of each are identical, // but for the fourth 't' is ASCII code 116, 's' is ASCII code 117