Please help explain this code, thank you very much~

shijizai

Please help explain this code, thank you very much~ [Copy link]

Regarding the points of the sine function, PI is 3.14; n and tablesize are two variables, and tablesize was previously defined as 256; I don't understand what the brackets mean, does anyone know? for(n=0;n

It is the integer sine value of a period

The sine wave value obtained by dividing a sine wave into 1/256 equal parts is multiplied by 2047 and then written into the sinTable array.

[quote][size=2][url=forum.php?mod=redirect&goto=findpost&pid=2385829&ptid=652185][color=#999999]wenyangzeng posted on 2018-7-26 17:27[/color][/url][/size] Multiply the sine wave value obtained by dividing a sine wave into 1/256 equal parts by 2047 and write it into the sinTable array. [/quote] {:1_103:}

[quote][size=2][url=forum.php?mod=redirect&goto=findpost&pid=2385829&ptid=652185][color=#999999]wenyangzeng posted on 2018-7-26 17:27[/color][/url][/size] Divide a sine wave into 1/256 equal parts and multiply the sine wave value by 2047 and write it into the sinTable array. [/quote] Why add 1?

[quote][size=2][url=forum.php?mod=redirect&goto=findpost&pid=2385854&ptid=652185][color=#999999]Shijizai posted on 2018-7-26 18:37[/color][/url][/size] Why add 1? [/quote] How much to add is up to the programmer. It may prevent the array data from having 0, which will cause problems when used as a divisor.

[quote][size=2][url=forum.php?mod=redirect&goto=findpost&pid=2385868&ptid=652185][color=#999999]wenyangzeng posted on 2018-7-26 19:27[/color][/url][/size] How much to add depends on the programmer. It may prevent the array data from having 0, which will cause problems when used as a divisor. [/quote] Okay, I understand, thank you

Please help explain this code, thank you very much~

huo_hu

It is the integer sine value of a period

wenyangzeng

The sine wave value obtained by dividing a sine wave into 1/256 equal parts is multiplied by 2047 and then written into the sinTable array.

huangxiexie

wenyangzeng posted on 2018-7-26 17:27 Multiply the sine wave value obtained by dividing a sine wave into 1/256 equal parts by 2047 and write it into the sinTable array.

shijizai

wenyangzeng posted on 2018-7-26 17:27 Divide a sine wave into 1/256 equal parts and multiply the sine wave value by 2047 and write it into the sinTable array.

Why add 1?

wenyangzeng

Shijizai posted on 2018-7-26 18:37 Why add 1?

How much to add is up to the programmer. It may prevent the array data from having 0, which will cause problems when used as a divisor.

shijizai

wenyangzeng posted on 2018-7-26 19:27 How much to add depends on the programmer. It may prevent the array data from having 0, which will cause problems when used as a divisor.

Okay, I understand, thank you