what to use for floating numbers in embedded C???

[Nidhitrivedi]

Hello all,

In my program i have the ans as floating point value...
Then which command i have to use?? As we have int,char. Likewise floating number is define by what?

I used float but its not working....

unsigned int finalans;
float temp=0;

finalans=i*795;///final answer will be i*795/100;
temp=(i*795)/100;
//so suppose there are 5 digits to display then,
lcdcmd(0x80);
lcddata((temp/10000)+0x30);
[U][B]lcddata(((temp%1000)/10)+0x30);[/B][/U] (here the error is coming of bad operand)
lcddata(((temp%100)/10)+0x30);
lcddata((temp%10)+0x30);

lcddata function is to diplay the value on lcd.
lcdcmd is to display first character on lcd.

Thanks to all....

 

[FvM]

Firstly, the specific error is generated because the "%" operator is undefined for float. You need to perform an explicite type cast before, either (long)temp % 1000 or (int)temp % 1000. The correct type depends on the number range of temp.

Secondly, temp=(i*795)/100 doesn't work if i has an int type and it's value is larger than 41. You should write i*7.95 instead.

Finally, it's a stupid idea to use float in this place, because you are performing pure integer arithmetic. Define temp as long and use a type cast in the conversion
temp=((long)i*795)/100;

A more convenient method for the decimal number display uses sprintf() by the way.

 

[Nidhitrivedi]

Thankyou so much it helped me....

 

[Jigar 4 Electronics]

Firstly, the specific error is generated because the "%" operator is undefined for float. You need to perform an explicite type cast before, either (long)temp % 1000 or (int)temp % 1000. The correct type depends on the number range of temp.

Secondly, temp=(i*795)/100 doesn't work if i has an int type and it's value is larger than 41. You should write i*7.95 instead.

Finally, it's a stupid idea to use float in this place, because you are performing pure integer arithmetic. Define temp as long and use a type cast in the conversion
temp=((long)i*795)/100;

A more convenient method for the decimal number display uses sprintf() by the way.

Can you explain how to do this with the help of sprintf().
A small and basic example will be enough and better for me.

Thanks in advance

 

[alexan_e]

How adout https://www.edaboard.com/threads/257992/#post1105703