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//CIRCULAR LINKED LIST
clear;
clc;
funcprot(0);
disp("Example 4.2");
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(i).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;
j=1;
while(i<pos)
if((link1(j).nexadd==link1(1)(1).add))
j=1;
i=i+1;
else
i=i+1;
j=j+1;
end
end
if(link1(j).nexadd~=link1(1)(1).add)
k=1;
if(j==1)
k=2;
while(link1(k).nexadd~=link1(1)(1).add)
link2(k-1)=link1(k);
k=k+1;
end
link2(k-1)=link1(k);
link2(k-1).nexadd=link2(1).add;
else
lin2=link1(j);
link1(j-1).nexadd=link1(j+1).add;
k=1;
while(link1(k).nexadd~=link1(j+1).add)
link2(k)=link1(k);
k=k+1;
end
link2(k)=link1(k);
k=k+2;
while(link1(k).nexadd~=link1(1)(1).add)
link2(k-1)=link1(k);
k=k+1;
end
link2(k-1)=link1(k);
end
else
link1(j-1).nexadd=link1(1)(1).add;
l=1;
while(link1(l).nexadd~=link1(1)(1).add)
link2(l)=link1(l);
l=l+1;
end
link2(l)=link1(l);
end
endfunction
//Calling Routine:
link1=struct('data',0,'add',0,'nexadd',0);
link1=append(4,link1);//This will actualy create a list and 4 as start
link1=append(6,link1);
link1=add(10,2,link1);
link1=delete1(4,link1);//As the list is circular the 4'th element refers to actualy the 1'st one
disp(link1,"After the above manuplations the list is");
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