Menu
Using the random index number, we have generated the random character from the string alphabet. We then used the StringBuilder class to append all the characters together. If we want to change the random string into lower case, we can use the toLowerCase() method of the String .
Example 1: Using the rand() Function to Generate Random Alphabets in C++ The following C++ program generates a random string alphabet by using rand() function and srand() function. The rand() function generates the random alphabets in a string and srand() function is used to seed the rand() function.
Here's a quick and dirty implementation. Hasn't been tested.
NSString *letters = @"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
-(NSString *) randomStringWithLength: (int) len {
NSMutableString *randomString = [NSMutableString stringWithCapacity: len];
for (int i=0; i<len; i++) {
[randomString appendFormat: @"%C", [letters characterAtIndex: arc4random_uniform([letters length])]];
}
return randomString;
}
Not exactly what you ask, but still useful:
[[NSProcessInfo processInfo] globallyUniqueString]
Sample output:
450FEA63-2286-4B49-8ACC-9822C7D4356B-1376-00000239A4AC4FD5
NSString *alphabet = @"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXZY0123456789";
NSMutableString *s = [NSMutableString stringWithCapacity:20];
for (NSUInteger i = 0U; i < 20; i++) {
u_int32_t r = arc4random() % [alphabet length];
unichar c = [alphabet characterAtIndex:r];
[s appendFormat:@"%C", c];
}
Surely you can make this shorter:
+(NSString*)generateRandomString:(int)num {
NSMutableString* string = [NSMutableString stringWithCapacity:num];
for (int i = 0; i < num; i++) {
[string appendFormat:@"%C", (unichar)('a' + arc4random_uniform(26))];
}
return string;
}
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With