将字符串转换为int以检查答案

Question

For my math question app I have two random numbers generated then I have 4 buttons as answers. I want to check the answer if the user pushes the right button but it seems not to work.

num1 and num2 are the labels which the random numbers are generated in so technically

num1.text = "(randomnum1)"

and num2.text = "(randomnum2)" Thanks.

I have the following code under button1 IBaction

    var sum = (num1) + (num2)
    if btn1.titleLabel = (sum){
            check.text = "right"            
    }

Answer 1

you have two options:

if btn1.titleLabel.toInt()! == sum

or

if btn1.titleLabel == String(sum)

consider the difference between = (assign) and == (is equal)

to assign a number to a label use

num1.text = "\(randomnum1)"

I recommend to use backing Int variables like randomnum1 to hold the random numbers which can used for the math for example

var randomnum1 = 0, randomnum2 = 0 // instance variables of the class

randomnum1 = randomFuntion()
randomnum2 = randomFuntion()

num1.text = String(randomnum1)
num2.text = String(randomnum2)

now the labels contain the string values of the random numbers, but you can do the math with the associated variables.

var sum = randomnum1 + randomnum2

after that you can check the result as mentioned above

if btn1.titleLabel == String(sum) {
   check.text = "right"   
}

Answer 2

Maybe you should do some convert before you add num1 and num2. (convert strings to integers before adding them up, also, you should convert string to integer fisrt when comparing sum and btn.titleLabel)