while loop to sum elements

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leon leon
leon leon 2013-10-16
回答： Maneet Kaur Bagga 2022-7-5
Use a while loop to sum up the elements of a vector (starting with the first element) until the sum is bigger than 14. Print out a message if the sum never gets bigger than 14. Otherwise, print out the sum. Both print statements should happen AFTER the loop has finished. Test the while loop with x=[2.2 4 9 7 8] and x=[-4 5 3 -5 1 -10 1 8]. Hint: A simple way to swap from one x to the other is to declare both assignments and just comment one out. Then you can demonstrate both to the TA without having to make a copy of the while loop. eg %x =[2.2 4 9 7 8]; x=[-4 5 3 -5 1 -10 1 8] Hint: You will need an index variable to tell if you’ve gone past the end of the array.

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回答（1 个）

Maneet Kaur Bagga
Ran in:
Hi leon leon
As per my understanding you want to find the sum of elements of the vector until the sum gets gretaer than 14 and want to print the result after the loop ends. Please find the below attached code as a solution. Hope it helps!
x = [1:10]
x = 1×10
1 2 3 4 5 6 7 8 9 10
sum=0
sum = 0
x = sort(x)
x = 1×10
1 2 3 4 5 6 7 8 9 10
i=1
i = 1
while(sum<14 && i<=length(x))
sum = sum + x(i)
if(sum==14)
break;
end
i = i + 1
end
sum = 1
i = 2
sum = 3
i = 3
sum = 6
i = 4
sum = 10
i = 5
sum = 15
i = 6
if(sum==14)
display("Sum exists");
elseif(sum<14 && i==length(x))
display("Sum can never be 14")
end

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