Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trialMichael Castro
11,959 PointsFinding the average of NSNumbers in an array with a for loop.
Create a float variable called runningTotal. Then, create a for in loop which iterates through the array you created in step 1. When the loop finishes running, the value of 'average' should be the average of the values contained in temp.
NSArray *temps = @[@(75.5), @(83.3), @(96), @(99.7)];
float average = 0;
float runningTotal = 0;
for (NSNumber *t in temps, t < temps.count, t++) {
runningTotal = (runningTotal + t);
average = runningTotal/temps.count;}
/*
for (NSUInteger *t in temps, t < temps.count, t++) {
runningTotal += [[temps objectAtIndex:t] floatValue];
average = runningTotal/temps.count;
}
*/
//NSNumber * average = [temps valueForKeyPath:@"@sum.self"];
1 Answer
sonu dhawan
1,989 PointsNSArray *temps = @[@75.5, @83.3, @96, @99.7]; // YOU DON'T NEED TO PUT DECIMALS OR INTS INSIDE PARENTHESIS
float average ; // IF YOU ARE GIVEN IN THE QUESTION NOT TO INITIALIZE THE VARIABLE "make yourself go exactly with the command what they were asking you to do " .
float runningTotal ;
for (NSNumber *itemsInTemp in temps) {
runningTotal += [ itemsInTemp floatValue] ;
}
average = runningTotal/temps.count;
Naomi Schettini
1,608 PointsNaomi Schettini
1,608 Pointswhat does the += do??