Thread: Parenthesis in convoluted if statements [FIXED]

  1. #1
    Registered User
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    Parenthesis in convoluted if statements [FIXED]

    Hi,
    I seem to have issues with how ==, && and || are evaluated. Particularly in the following:
    Code:
    uint8_t  16float_equals(tfl16_t a, tfl16_t b) {
        if ((((a^b)==0)) || ((a&0x3ff==0) && (b&0x3ff==0))) {// (((a<<17)|(b<<17))==0)) { // (((a<<1)|(b<<1))==0)) {
            return 1; 
        } else {
            return 0;
        }
    }
    



    The second part checks for 0 and their variations in a custom 16 float in bit representation ie:
    0b1000000000000000 = 0
    0b0000010000000000 = 0
    etc..

    but it doesnt work for the following:
    32768 and 0 where it says they are not the same


    Last edited by TomHaddock; 11-24-2020 at 05:07 PM.

  2. #2
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    It has now been fixed, I think I get the order more now

    Code:
    uint8_t
    Code:
      tfl_equals(tfl16_t a, tfl16_t b) {
        if ((((a^b)==0)) || (((a&0x3ff)==0) && ((b&0x3ff)==0))) {// (((a<<17)|(b<<17))==0)) { // (((a<<1)|(b<<1))==0)) {
            return 1; 
        } else {
            return 0;
        }
    }

  3. #3
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