NSLog default break line

Question

I am very new to Objective-C and I am starting to learn simple things. In this case, I want to create a pyramid using the * symbol.

Problem: Everytime * is printed, it includes a line break. How can I get rid of it to create a pyramid look? I thought I had to add \n to cause a line break in the Break line text I added.

Right now, I have this code to create a pyramid:

    //Pyramid
    int a,b;
    int x=5;

    for(a = 1; a <= x; a++){

        for(b=1; b<=a; b++){
            NSLog(@"*");
        }

        NSLog(@"Break line");

    }

Result:

2014-02-23 10:44:35.264 Pyramid[614:303] *
2014-02-23 10:44:35.266 Pyramid[614:303] Break line
2014-02-23 10:44:35.267 Pyramid[614:303] *
2014-02-23 10:44:35.267 Pyramid[614:303] *
2014-02-23 10:44:35.267 Pyramid[614:303] Break line
2014-02-23 10:44:35.268 Pyramid[614:303] *
2014-02-23 10:44:35.268 Pyramid[614:303] *
2014-02-23 10:44:35.269 Pyramid[614:303] *
2014-02-23 10:44:35.269 Pyramid[614:303] Break line
2014-02-23 10:44:35.269 Pyramid[614:303] *
2014-02-23 10:44:35.270 Pyramid[614:303] *
2014-02-23 10:44:35.270 Pyramid[614:303] *
2014-02-23 10:44:35.270 Pyramid[614:303] *
2014-02-23 10:44:35.271 Pyramid[614:303] Break line
2014-02-23 10:44:35.271 Pyramid[614:303] *
2014-02-23 10:44:35.272 Pyramid[614:303] *
2014-02-23 10:44:35.272 Pyramid[614:303] *
2014-02-23 10:44:35.272 Pyramid[614:303] *
2014-02-23 10:44:35.273 Pyramid[614:303] *
2014-02-23 10:44:35.273 Pyramid[614:303] Break line

What you're doing is quite good so far. The real problem, though, is that no matter how many times you say `NSLog(@"*")` you will get only ONE log line containing ONE star. You need to accumulate _many_ stars into ONE string so that ONE log line will contain _many_ stars. To do _that_, you will need to learn about NSString and how to combine multiple NSString objects into one... — matt, Feb 23 '14 at 03:05
NSLog is intended for diagnostic messages, not generalized output. For generalized output use `printf`. — Hot Licks, Feb 23 '14 at 03:27

score 5 · Answer 1 · answered Feb 23 '14 at 03:25

5

NSLog always outputs a newline at the end, as well as other info at the start.

You can use printf("*"); to output to the console without a newline. Include \n when you want a newline.

for (NSUInteger outerIndex = 1; outerIndex <= 5; ++outerIndex) {
    for (NSUInteger innerIndex = 1; innerIndex <= outerIndex; ++innerIndex) {
        printf("*");
    }

    printf("\n");
}

answered Feb 23 '14 at 03:25

Dave Wood

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Even though my answer is the accepted one, this answer is good for a non-NSLog approach. – Flipper Feb 23 '14 at 04:04

score 1 · Accepted Answer · edited May 23 '17 at 11:57

1

As stated in the comments, NSLog will always only output one line and you will not be able to avoid that like you can do in Java. Alternatively you should look into building strings (such as described here: Shortcuts in Objective-C to concatenate NSStrings).

An example:

//Pyramid
int a,b;
int x=5;

for(a = 1; a <= x; a++){
    NSMutableString *string = [NSMutableString string];
    for(b=1; b <= a; b++){
        [string appendString:@"*"];
    }

    NSLog(@"%@", string);
}

edited May 23 '17 at 11:57

Community

1
1

answered Feb 23 '14 at 03:20

Flipper

2,589
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All answers are good but I like this solution :) I am also trying to figure it out myself as explained by @matt. Thanks for the help. – JunM Feb 23 '14 at 03:32

NSLog default break line

2 Answers2