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need FAST reply !please

dydraxdydrax Posts: 15Member
i confused with my homework,i very don't understand when the programs solution without using pascal,when the theory says:
procedure or function mode
x:=x(y,x)+1
for example:
function A(i:integer;j:integer):integer;
begin
if(i>=2)and(j>=2)then A:=(i-1,A(i,j-1)+1)
else
if(i>=2)and (j=1)then A:=A(i-1,2)
else
if(i=1)and(j>=1)then A:=j
else
a:=-1
end;
the question says when the program called A(4,7) why the answer is 509 explain the way!
i don't know solving the problem when i found this A:=(i-1,4(i,j-1)+1)and A:=(i-1,2)and like A(x-1,y)+1 and ext please help me to know solving this problem
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