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//Unsolved Example 1
clear;
clc;
disp("example 3.7");
//To determine the syntacticaly valid string
function[l]=strlen(x)
i=1;
l=0;
[j,k]=size(x)
for i=1:k
l=l+length(x(i));
end
endfunction
function[]=stringvalid(str)
str=string(str);
stack=struct('a','0','top',0);
l1=strlen(str);
valid=1;
l=1;
while(l<=l1)
if(str(l)=='('|str(l)=='['|str(l)=='{')
if(stack.top==0)
stack.a=str(l);
stack.top=stack.top+1;
else
stack.a=[stack.a(:,:) str(l)];
stack.top=stack.top+1;
end
disp(stack);
end
if(str(l)==')'|str(l)==']'|str(l)=='}')
if(stack.top==0)
valid=0;
break;
else
i=stack.a(stack.top);
b=stack.a(1);
for i1=2:stack.top-1
b=[b(:,:) stack.a(i1)]
end
stack.a=b;
stack.top=stack.top-1;
symb=str(l);
disp(stack);
if(((symb==')')&(i=='('))|((symb==']')&(i=='['))|((symb=='}')&(i=='{')))
else
valid=0;
break;
end
end
end
l=l+1;
end
if(stack.top~=0)
valid=0;
end
if(valid==0)
disp("Invalid String");
else
disp("Valid String");
end
endfunction
//Calling Routine:
stringvalid(['(' 'A' '+' 'B' '}' ')'])
stringvalid(['{' '[' 'A' '+' 'B' ']' '-' '[' '(' 'C' '-' 'D' ')' ']'])
stringvalid(['(' 'A' '+' 'B' ')' '-' '{' 'C' '+' 'D' '}' '-' '[' 'F' '+' 'G' ']'])
stringvalid(['(' '(' 'H' ')' '*' '{' '(' '[' 'J' '+' 'K' ']' ')' '}' ')'])
stringvalid(['(' '(' '(' 'A' ')' ')' ')'])
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