# How to display the results of a for loop

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Jesse Schultz 2019 年 9 月 10 日

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 件のコメント

Stephen Cobeldick 2019 年 9 月 10 日
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 件)

Urmila Rajpurohith 2019 年 9 月 13 日
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);

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