string-concatenation

I was reading this documentation page, http://developer.android.com/reference/android/util/Log.html . The section here caught my eye: Tip: Don't forget that when you make a call like Log.v(TAG, "index=" + i); that when you're building the string to pass into Log.d, the compiler uses a StringBuilder and at least three allocations occur: the StringBuilder itself, the buffer, and the String object. Realistically, there is also another buffer allocation and copy, and even more pressure on the gc. That means that if your log message is filtered out, you might be doing significant work and incurring

This question already has answers here : Shortcuts in Objective-C to concatenate NSStrings (30 answers) Possible Duplicate: How do I concatenate strings in Objective-C? Firstly, the platform is iPhone and label.text changes the label displayed. Consider this scenario: I've an array of integers. And I want to display it on the screen. Here's my take on it: -(IBAction) updateText: (id)sender { int a[2]; a[0]=1; a[1]=2; a[2]=3; for (int i=0; i<=10;i++) label.text = [NSString stringByAppendingString: [NSString stringWithFormat: @"%i", a[i]]]; } As you can probably see, I'm pretty confused. Pls pls

This question already has an answer here: How to concatenate string variables in Bash 30 answers How can I concat strings in shell? Is it just... var = 'my'; var .= 'string'; ? How about this: var="${var}string" dldnh It depends on the shell, but since question was tagged bash: var='my' var=$var'string' No. For various reasons. # most sh-compatible shells var="my" var="$var string" # advanced shells var="my" var+=" string" 来源： https://stackoverflow.com/questions/9445259/concat-strings-in-a-shell-script

I have an array of strings and I would like to create a new string that is a concatenation of all the array elements. Any help is appreciated, thanks #include <stdio.h> #include <stdlib.h> #include <string.h> char *concatenate(size_t size, char *array[size], const char *joint){ size_t jlen, lens[size]; size_t i, total_size = (size-1) * (jlen=strlen(joint)) + 1; char *result, *p; for(i=0;i<size;++i){ total_size += (lens[i]=strlen(array[i])); } p = result = malloc(total_size); for(i=0;i<size;++i){ memcpy(p, array[i], lens[i]); p += lens[i]; if(i<size-1){ memcpy(p, joint, jlen); p += jlen; } } *p

This question already has an answer here: What is a NullPointerException, and how do I fix it? 12 answers I have a web application that needs to be stored its data on specific tables depending on the user's input. e.g. if a user input Code "A" their data will be saved to DatabaseA, while if a user input Code "B", the data will be saved to DatabaseB. I need to know if there is way to manipulate the prepared statement in order to just concatenate the code into the end of the prepared statement string. I have 3 tables, MachineProblem2A,2B,and 2C. is there a way to just simply concatenate the code