format percentages

Question

Created 2w

Replies 3

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I'm using XCODE with Swiftui. I want to know how I can format percentages in the program to whole numbers with a % sign without any decimal places to the screen. For instance if the program figures 33.3333 I want to print 33% to the screen. If I have 67.85762 in the program I want to print 67% (or 68% if it can be rounded) to the screen. Please help. Thanks

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Answer 1

darkpaw OP

1w

print(String(format: "%.0f%%", 33.3333)) prints 33%

Explanation:

String(format: "%.2f", value)

%.2f formats and rounds to the number of decimal places given, in this case, 2.

For zero decimal places you just use 0, i.e.:

String(format: "%.0f", value)

To display the percentage sign as a percentage sign, and not be interpreted by the formatting you need to add in two of them: String(format: "%.2f%%", value)

So: String(format: "%.2f%%", 67.85762) is 67.86%.

String(format:...) rounds accordingly, i.e.:

let pi = 3.1415926535

String (format: "%.10f", pi) // "3.1415926535"
String (format: "%.9f", pi)  // "3.141592654"
String (format: "%.8f", pi)  // "3.14159265"
String (format: "%.7f", pi)  // "3.1415927"
String (format: "%.6f", pi)  // "3.141593"
String (format: "%.5f", pi)  // "3.14159"
String (format: "%.4f", pi)  // "3.1416"
String (format: "%.3f", pi)  // "3.142"
String (format: "%.2f", pi)  // "3.14"
String (format: "%.1f", pi)  // "3.1"
String (format: "%.0f", pi)  // "3"

0

Answer 2

robert0605 OP

1w

Thank you.

0

Answer 3

robert0605 OP

1w

I get 0%. Here's my code:

        print(tipc)                                                                                                     
        let percentString = String(format: "%.0f%%", tipc)
        print(percentString)

18.181818181818183
0%.

What did I do wrong?

0