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cfloating-point-conversionnesc

nesC: converting float number to integer

I want to make xor of an uint16 with a floating point number like the following:

uint16_t a=20000;
double r,x,xo;
r=3.8;
xo=.1;
x=(int) r*xo*(1-xo);
c=a^x;

When I run the test the following error occurs:

invalid operand to binary ^

How can I convert x to an integer value with 16 bit?

Solution

  • The problem is that x is still a double value. The cast in 

    x=(int) r*xo*(1-xo);

    truncates the number, but it's still a double number.

    To do what you want you need to declare x as int or cast right before xor:

    c=a^((int)x);