Programming doubt

in asm we are using lookup table for displaying the numbers.but in c what is the function can we use?

And you mean look-up tables for getting the ascii value of a number digit?

Then in C, why not use the same? I mean create a look-up table too.

However, you can also use something else. If you look at the ascii table, digits 0 to 9 have consecutive ascii values, starting from 0x30 or 48 decimal. So you can add the digit you have to the 48 value and the result of the summation is the ascii code of your digit!

However, please be more detailed in your question. Perhaps I have understood something different.

i'm guessing you are looking for something to convert numbers to an ASCII string for displaying:

char numberString[20];

// convert int to string
snprintf(numberString, sizeof(numberString), "%d", numberToDisplay);

// terminate string, just in case
numberString[sizeof(numberString) - 1] = 0;

// display the string
yourDisplayFunction(numberString);

--- alternatively you can use sprintf instead of snprintf if that function is not supported by your compiler's library