Processing 1.0 - Processing Discourse - adding a char to end of string problem

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Index › Programming Questions & Help › Syntax Questions › adding a char to end of string problem

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adding a char to end of string problem (Read 229 times)

frank26080115

adding a char to end of string problem
Jul 30^th, 2008, 5:17am

/*
run this code below to illustrate my problem
how do I properly add a character to the end of a string so the if statements return true?
*/

void checkMatch(String temp)
{
print(temp);
println(" == AA");

print("is this a match? ");

if(temp == "AA")
{
println("yes");
}
else
{
println("no");
}

println("why?\n\r");
}

void setup()
{
String temp = "";
temp += 'A';
temp += "A";

checkMatch(temp);

temp = "";
temp += "A";
temp += "A";

checkMatch(temp);

temp = "AA";

checkMatch(temp);
}

polymonkey

Re: adding a char to end of string problem
Reply #1 - Jul 30^th, 2008, 5:51am

A string is a class, so normal if checks won't work. When you check one string against another like temp == "AA" you are actually checking the memory location of the string. By using the String.equals("blah") function it will check the letters to see if they match.

So try this instead

Quote:

void checkMatch(String temp)
{
print(temp);
println(" == AA");

print("is this a match? ");

if(temp.equals("AA") == true) // I changed this line
{
println("yes");
}
else
{
println("no");
}

println("why?\n\r");
}

void setup()
{
String temp = "";
temp += 'A';
temp += "A";

checkMatch(temp);

temp = "";
temp += "A";
temp += "A";

checkMatch(temp);

temp = "AA";

checkMatch(temp);
}

MattD(polymonkey)

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