Objective C reference to a variable - objective-c

Question

I have a list of variables that are named based on two digits then a word i.e. val11 or val26
I need to perform a check on whether a certain value for a variable is equal to the next variable i.e. that val32 == val33
I have the names of the first variables that I need to check in an NSArray (i.e val33)
I can then write a function to perform the check as a lot of long winded if statements
-(void)checkValues:(NSArray *)valueArray {
for (int x = 0; x < [valueArray count]; x++) {
tempStr = [offFiles objectAtIndex:x];
//split variable name
NSString *value = [tempStr substringWithRange:NSMakeRange(3,2];
int numValue= [value intValue];
//long winded if statement
if (numValue == 11) {
if(val11 == val12) {
//do something
}
}
if (numValue == 12) {
if(val12 == val13) {
//do something
}
}
.... etc
if (numValue == 87) {
if(val87 == val88) {
//do something
}
}
}
}
Is there any way I can remove the long winded if statement and replace it with a reference to the next variable so that no matter what variable name is in the array I can easily just check it against the next variable
Something like the excel command indirect
=INDIRECT(CONCATENATE("Cell!A",numValue + 1))

Answer 1

Unless there is some need for you to store your data in a set of discrete separate variables, this is clearly a situation were an array would work for you. This could be either a c-style array or one using NSArray - its up to you.
Using a c-style array (assuming 10 completely made up values):
int myValues[10] = { 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 }
Then your series of if statements can be reduced to one:
if (myValues[numValue] == myValues[numValue+1]) {
// so something
}
So if numValue is 3, it would compare myValues[3] and myValues[4] - essentially the same as comparing val3 and val4 in your scheme. Please note that arrays are zero based - the first value is accessed myValue[0] - so if your numbering scheme is 1-based then you need to subtract 1, e.g.:
if (myValues[numValue-1] == myValues[numValue]) {
// do something
}

Answer 2

Beside from the syntax bugs (like starting variable names with a number), what you are looking for is the switch() statement:
switch(a)
{
case 1: // if a is 1 do the following
printf("a is 1");
break;
case 2: // if a is 2
printf("a is 2");
break;
....
default: // if a was none of the cases before do this
printf("a sucks!!");
}
Notice that you always need a break; statement at the end of each case x: