Access array data

[necy36]

A thumbwheel switch (swt) has been assigned a 16 element array to determine which number is selected. How would I access that data? When I try *swt, I recieved error messages and warnings. When I use swt[0-16], I get zeroes as the switch values.

[Larry J Siddens]

Without actually seeing your code and if you are using

swt[0-16]

Then the actual index into the array is -16.

Larry J. Siddens

[CPallini]

What about a good C language tutorial? :)

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[_Superman_]

You can use only integral expressions as the switch expression. What type of array is it? If it is a character array, you must use the string functions in the if statement. If it is an integral array, you are storing multiple values. You must use the array subscript [] to specify which element to check.

«_Superman_» I love work. It gives me something to do between weekends.

[necy36]

Original code looks like this: if (local->decode) { swt[0] = 0; swt[1] = 1; swt[2] = 1; swt[3] = 1; up to [15] } locals->temp = 0; for (mode_index = 0; mode_index < 16; mode_index++) { if (swt[mode_index] == 1) { locals->temp += (1 << mode_index); } } ==================================== What I am attempting to do looks like this where I tried *swt and swt[0], swt[1], swt[2], etc...: nom3as = nim3as if (nom3as == 0) nom3ac = 0; else nom3as |= 0x00002000; nom3ac = swt;

[necy36]

I tried using []. Will I have to use it for each element of the array?

[Larry J Siddens]

Yes. Say you have an array: int p[] = { 5, 4, 3, 2, 1 }; then to get the 3rd element use: int x = p[2]; This will set x to 3. Remember, arrays start at index 0 instead of 1. To loop through for( int 1 = 0; i < 5; i++ ) { x = p[i]; }

Larry J. Siddens

[_Superman_]

Yes. You will have 16 array elements ranging from swt[0] to swt[15]

«_Superman_» I love work. It gives me something to do between weekends.

[Larry J Siddens]

In your last line: nom3ac = swt; You're setting the variable nom3ac to the address of the start of the array (or the address of swt[0].) Is this correct?

Larry J. Siddens

[necy36]

Yes, that's correct.