How to add an integer value into NSMutableArray?

Question

NSMutableArray * val;
val = [[NSMutableArray alloc] initWithCapacity:15];

/*int outlineWidth = barOutlineWidth;
int outlineHalfWidth = (outlineWidth > 1) ? outlineWidth * 0.5f : 0;
 */
for ( Bar * obj in values )
{  
  // calcualte the bar size
  float value  = [obj value];
  float scale  = ( value / maxValue );

  // shift the bar to the top or bottom of the render line
  int pointY   = lineHeight + ( (lineWidth * 0.5f) * ( ( value >= 0.0f ) ? -1 : 1 ) );
  int barHeight = height * scale;
  NSLog(@"%d", barHeight);   
  CGRect barRect = CGRectMake(pointX, pointY, width, -barHeight);
  [val addObject:[NSNumber numberWithInt:barHeight]];
                     NSLog(@"%d", val);

I want to add the barheight (int) into array val...Is this possible? while running the code ,,

ession started at 2010-09-16 13:21:50 +0530.] 2010-09-16 13:21:53.791 BarGraphSample[3168:20b] 78 2010-09-16 13:21:53.797 BarGraphSample[3168:20b] 69398112 2010-09-16 13:21:53.807 BarGraphSample[3168:20b] 235 2010-09-16 13:21:53.812 BarGraphSample[3168:20b] 69398112 2010-09-16 13:21:53.813 BarGraphSample[3168:20b] 156 2010-09-16 13:21:53.814 BarGraphSample[3168:20b] 69398112

this is the output...

here the actual barheights are 78,235,156, while printing the array val..im getting like what you see..69398112.6939112........

what should i do?

Answer 1

Add a number instead.

NSNumber* foo = [NSNumber numberWithInteger:42];

then add foo.

Answer 2

You can only add pointers to objects to an NSMutableArray. If you use the NSNumber class though to wrap your integer, you should then be able to add that to the array.

int x = 10;
NSNumber* xWrapped = [NSNumber numberWithInt:x];
NSMutableArray* array = [[NSMutableArray alloc] initWithCapacity:15];
[array addObject:xWrapped];
int xOut = [[array lastObject] intValue]; //xOut == x;

Hope this helps.

Answer 3

The issue is with your NSLog string namely

NSLog(@"%d", val);

%d is in fact the format specifier for an integer (int). You are passing it a NSMutableArray object.

Change the NSLog to

NSLog(@"%@", val);

The %@ expects an object, and this will typically print out [myObject description], in this case a description of your val array.