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//STACK USING CIRCULAR LINKED LIST
funcprot(0)
function[link2]=append(ele,link1)
link2=list(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,,0,0);
if(link1(1)(1).add==0)
link1(1)(1).data=ele;
link1(1)(1).add=1;
link1(1)(1).nexadd=1;
link2(1)=link1(1)(1);
else
if(link1(1)(1).nexadd==link1(1)(1).add)
lin2=link1(1)(1);
lin2.data=ele;
lin2.add=link1(1)(1).add+1;
link1(1)(1).nexadd=lin2.add;
lin2.nexadd=link1(1)(1).add;
link2(1)=link1(1)(1);
link2(2)=lin2;
else
lin2=link1(1)(1);
i=1;
while(link1(i)(1).nexadd~=link1(1)(1).add)
i=i+1;
end
j=i;
lin2.data=ele;
lin2.add=link1(i).add+1;
lin2.nexadd=link1(1)(1).add;
link1(i).nexadd=lin2.add;
link2(1)=link1(1)(1);
i=2;
while(link1(i).nexadd~=lin2.add)
link2(i)=(link1(i));
i=i+1;
end
link2(i)=link1(i);
link2(i+1)=lin2;
end
end
endfunction
function[link2]=add(ele,pos,link1);
link2=list(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,,0,0);
i=1;
while(i<=pos)
if(link1(i).nexadd==link1(1)(1).add)
break;
else
i=i+1;
end
end
if(link1(i).nexadd~=link1(1)(1).add)
i=i-1;
lin2.data=ele;
lin2.add=i;
j=i;
while(link1(j).nexadd~=link1(1)(1).add)
link1(j).add=link1(j).add+1;
link1(j).nexadd=link1(j).nexadd+1;
j=j+1;
end
link1(j).add=link1(j).add+1;
lin2.nexadd=link1(i).add;
link1(i-1).nexadd=lin2.add;
k=1;
while(k<i)
link2(k)=link1(k);
k=k+1;
end
link2(k)=lin2;
k=k+1;
link2(k)=link1(k-1);
k=k+1
l=k-1;
while(k~=j)
link2(k)=link1(l);
k=k+1;
l=l+1;
end
link2(j)=link1(j-1);;
link2(j+1)=link1(j);
else
if(i==pos)
k=1;
lin2.data=ele;
lin2.add=link1(i-1).add+1;
link1(i).add=link1.add+1;
lin2.nexadd=link1(i).add;
link1(i).nexadd=link1(1)(1).add;
k=1;
while(k<pos)
link2(k)=link1(k);
k=k+1;
end
link2(k)=lin2;
link2(k+1)=link1(k)
end
end
endfunction
function[link2]=delete1(pos,link1)
link2=list(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,,0,0);
i=1;
if(link1(1)(1).add==0)
disp("Invalid");
else
if(link1(1)(1).nexadd==link1(1)(1).add)
link1(1)(1).add=0;
link1(1)(1).nexadd=0;
link1(1)(1).data=0;
link2(1)=link1(1)(1);
else
while(i<=pos)
if((link1(i).nexadd==link1(1)(1).add))
break;
else
i=i+1;
end
end
if(link1(i).nexadd~=link1(1)(1).add)
i=i-1;
j=1;
if(i==1)
j=1;
while(link1(j).nexadd~=link1(1)(1).add)
link2(j)=link1(j);
j=j+1;
end
link2(j)=link1(j);
else
link1(i-1).nexadd=link1(i+1).add;
while(link1(j).nexadd~=link1(i+1).add)
link2(j)=link1(j);
j=j+1;
end
if(j~=i-1)
link2(j)=link1(j);
link2(j+1)=link1(j+1);
k=i+1;
l=2;
else
link2(j)=link1(j);
k=i+1;
l=1;
end
while(link1(k).nexadd~=link1(1)(1).add)
link2(j+l)=link1(k);
k=k+1;
l=l+1;
end
link2(j+l)=link1(k);
end
else
if(i==pos)
j=1;
link1(i-1).nexadd=link1(1)(1).add;
while(j<=i-1)
link2(j)=link1(j);
j=j+1;
end
end
end
end
end
endfunction
function[sta]=push(ele,stack)
if(stack.top==0)
stack.a=ele;
stack.top=stack.top+1;
sta=stack;
else
i=1;
link1=struct('data',0,'add',0,'nexadd',0);
while(i<=stack.top)
link1=append(stack.a(i),link1);
i=i+1;
end
link1=append(ele,link1);
stack.top=stack.top+1;
a=[stack.a(:,:) link1(stack.top).data];
stack.a=a;
sta=stack;
end
endfunction
function[ele,sta]=pop(stack)
ele=-1;
sta=0;
if(stack.top==0)
disp("Stack Underflow");
return;
else
i=1;
link1=struct('data',0,'add',0,'nexadd',0);
while(i<=stack.top)
link1=append(stack.a(i),link1);
i=i+1;
end
ele=link1(stack.top).data;
link1=delete1(stack.top,link1);
stack.top=stack.top-1;
i=2;
a=link1(1)(1).data
while(i<=stack.top)
a=[a(:,:) link1(i).data];
i=i+1;
end
stack.a=a;
sta=stack;
end
endfunction
function[stack]=empty()
stack=struct('a',0,'top',0);
endfunction
//Calling Routine:
stack=empty()//Create an empty stack
stack=push(4,stack);
stack=push(55,stack);
stack=push(199,stack);
stack=push(363,stack);
[ele,stack]=pop(stack);
disp(stack,"After the above operations stack is:");
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