Question

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 - (void)applicationDidFinishLaunching:(UIApplication *)application {resultValues.text = @"";
[[UIAccelerometer sharedAccelerometer] setUpdateInterval: 1.0 / kUpdateFrequency];
[[UIAccelerometer sharedAccelerometer] setDelegate:self];
 }
  - (void)accelerometer:(UIAccelerometer*)accelerometer      didAccelerate:(UIAcceleration*)acceleration 
 {
x = acceleration.x;
y = acceleration.y;
z = acceleration.z;
printf("\n%d", x);
printf("\n%d", y);
printf("\n%d", z);

}

Answer 1

The problem is with your printf statements.

The UIAcceleration class defines its properties like so:

@property(nonatomic, readonly) UIAccelerationValue x

And UIAccelerationValue is typedef‘ed like so:

typedef double UIAccelerationValue

The d printf specifier is for ints. You want one for doubles. You want something like so:

printf("\n%g %g %g", acceleration.x, acceleration.y, acceleration.z);

(You can use f or e as well. See: http://en.wikipedia.org/wiki/Printf#printf_format_placeholders )