String

Consider String to be equivalent to the following C strings

#define MAX_STRING_LENGTH 255
typedef char allcotString[MAX_STRING_LENGTH+1];

The built-in type String should support:

concatenation:

for instance x + y or concat(x,y),

length:

for instance length(x),

printing:

for instance print(x),

equality-test:

for instance x = y,

unequality-test:

for instance x -= y,

substring:

for instance substring(x,i,j).

However, for the purpose of the assignment 3, the last three operations are not required.