Question

Ok. This is got to be one of the weirdest errors I have faced. I have these 2 lines in my code

 int id=i*2000*512+512*row+column;
 if (id==1){printf("This is output %f %f %f %i \n",entire_red[id],entire_green[id],entire_blue[id],id);}

and it gives me the output

This is the output 0.000000 0.000000
0.000000 109456488.

I have no clue what’s happening!

Answer 1

The %f format specifier expects a double (float is implicitly converted to double for variadic functions). If variable_red et al are not float or double variables, then printf will be processing the arguments incorrectly, and that could explain why the id integer is printing incorrectly.

Try this:

if (id==1)
    printf("This is output %f %f %f %i\n", (double)entire_red[id],(double)entire_green[id],(double)entire_blue[id],id);

Alternatively, ensure you are using the correct format specifiers for the entire_red, entire_green and entire_blue variables.