CODEWITHSUNDEEP
iphoneobjective-c
mohamad
mohamad

Reputation: 11

How to get a number from a text field?

How I can scan a number from a text field?

For example, in C

int x,area;
scanf("%d",&x);
area=r*r*3.14;
printf(" the area is %d",area);

How to do this on iPhone in Objective-C with a text field?

Upvotes: 1

Views: 409

Answers (3)

Robot Woods
Robot Woods

Reputation: 5687

if it's in a textfield, you can do 

double r=[textFieldName.text doubleValue];
NSString *result = [NSString stringWithFormat:@"the area is %f",r*r*3.14];
someLabelYouAreUsingToDisplayResults.text=result;

Upvotes: 2

Stephen Canon
Stephen Canon

Reputation: 106117

What you wrote works perfectly fine in Objective-C (or rather would, if it wasn't buggy). Everything that works in C works in Objective-C, without modification.

That said, there are more idiomatic ways to do such things in the Objective-C language (and Cocoa libraries), which I'm sure others will point out to you. See Robot Woods's answer for an idiomatic example of how to read from a text field, for instance.

Upvotes: 1

ughoavgfhw
ughoavgfhw

Reputation: 39905

Check out NSScanner. It performs a similar function to scanf, but works on NSString objects.

Upvotes: 2

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