How to display the results of a for loop

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Jesse Schultz
Jesse Schultz 2019-9-10
编辑： Walter Roberson 2023-7-26
I want to make a game of 21, that starts with the user getting two random cards and then printing out what they get, using a for loop keeps saying "Index exceeds the number of array elements(1)."
my code is
for i =1:2
card = randi([0 10]);
if (card ==0)
card = 'A'; %if the result is 0, rename it to A
end
end
fprintf("You have been given 2 cards, %d and %d" , card(i))
  1 个评论
Stephen23
Stephen23 2019-9-10
编辑：Stephen23 2019-9-10
This defines a scalar numeric (an integer from 0 and 10, inclusive), which you name card:
card = randi([0 10])
Your code does not do anything that changes the size of card., or allocate/concatenate/etc it into any other variable. On each loop iteration you redefine card as a new scalar.
Then after the loop (whose last iteration defines i=2) you use this code:
card(i)
card only has one element (you defined it to be scalar), but you are trying to access its 2nd element. Thus the error.

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回答（1 个）

Urmila Rajpurohith
Urmila Rajpurohith 2019-9-13
As mentioned above the variable “card” is a scalar.
To display the results of for loop you can create a Null vector and append the card value to the vector and while printing the output you can print the vector.
result=[];
for i =1:2
card = randi([0 10])
if (card ==0)
card = 'A'; %if the result is 0, rename it to A
end
result=[result card];
end
fprintf("You have been given 2 cards, %d %d", result);
  2 个评论
GAGANDEEP KAUR SIDHU
GAGANDEEP KAUR SIDHU 2023-7-26
编辑：Walter Roberson 2023-7-26
result=[];
for i =1:2
card = randi([0 10])
if (card ==0)
card = 'A'; %if the result is 0, rename it to A
end
result=[result card];
end
fprintf("You have been given 2 cards, %d %d", result);
Walter Roberson
Walter Roberson 2023-7-26
编辑：Walter Roberson 2023-7-26
Ran in:
@GAGANDEEP KAUR SIDHU
Suppose 0 is randomly generated, and then (for example) 8. Then the sequence would go
result = []
result = []
card = 0 %assumption for testing
card = 0
card = 'A' %because of if test
card = 'A'
result = [result card]
result = 'A'
card = 8 %assumption for testing
card = 8
result = [result card]
result = ''
Where is the output ?
fprintf("You have been given 2 cards, %d %d", result);
You have been given 2 cards, 65 8
Okay, I see the 8 there, but what is the 65 ?

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