Getting errors in NSError code - objective-c

Question

Am getting errors in this piece of code; I have placed the error messages in the comments. Can't figure it out.
Thanks in advance.
#import <Foundation/Foundation.h>
int main (int argc, const char * argv[])
{
#autoreleasepool {
NSMutableString *str = [[NSMutableString alloc]init];
for (int i = 0; i < 10; i++) {
[str appendString:#"Aaron is cool!\n"];
}
// Declare a pointer to an NSError object, but don't instantiate it.
// The NSError instance will only be created if there is, in fact, an error.
NSError *error = nil;
// Pass the error pointer by reference to the NSString method
BOOL success =[str writeToFile:#"/tmp/cool.txt"; // Expected "]"
atomically:YES // Bad receiver type 'int'
encoding:NSUTF8StringEncoding
error:&error];
// Test the returned BOOL, and query the NSError if the write failed
if (success) {
NSLog(#"done writing /tmp/cool.txt");
} else {
NSLog(#"writing /tmp/cool/txt failed:#", error localizedDescription); // Expected ')'
}
}
return 0;
}

Answer 1

If your code doesn't have any typos this is the problem
// Pass the error pointer by reference to the NSString method
BOOL success =[str writeToFile:#"/tmp/cool.txt"; // Expected "]"
atomically:YES // Bad receiver type 'int'
encoding:NSUTF8StringEncoding
error:&error];
Remove the semicolon ";" from here.
BOOL success =[str writeToFile:#"/tmp/cool.txt"; // Expected "]"

Answer 2

try this:
#autoreleasepool {
NSMutableString *str = [[[NSMutableString alloc]init] autorelease];
for (int i = 0; i < 10; i++) {
[str appendString:#"Aaron is cool!\n"];
}
NSError *error = nil;
BOOL success =[str writeToFile:#"/tmp/cool.txt"
atomically:YES
encoding:NSUTF8StringEncoding
error:&error];
if (success) {
NSLog(#"done writing /tmp/cool.txt");
} else {
NSLog(#"writing /tmp/cool/txt failed: %#", [error localizedDescription]);
}
}
return 0;