Thread: bit manipulation need help urgent

  1. #1
    Registered User
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    Nov 2008
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    Thumbs up bit manipulation need help urgent

    Code:
    please help me with the following c code
    
    Bit manipulation: 
    a. In the following code snippet: 
    i. Replace xxxx with code that sets bit 3 of variable a. 
    ii. Replace zzzzz with code that sets a equal to b with bit 4 cleared 
    iii. Replace mmm with code that sets a equal to b with bit 5 set and bit 7 cleared 
    
    int myfunc(int b) 
    { 
    int a = 0; 
    if (b == 10) 
    xxxx // set bit 3 of a 
    else if (b == 20) 
    zzzzzz // a = b with bit 4 cleared 
    else 
    mmmmm // a = b with bit 5 set and 7 cleared 
    return a; 
    }

  2. #2
    Registered User claudiu's Avatar
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    Read the homework policy.
    1. Get rid of gets(). Never ever ever use it again. Replace it with fgets() and use that instead.
    2. Get rid of void main and replace it with int main(void) and return 0 at the end of the function.
    3. Get rid of conio.h and other antiquated DOS crap headers.
    4. Don't cast the return value of malloc, even if you always always always make sure that stdlib.h is included.

  3. #3
    ATH0 quzah's Avatar
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    Then read the bitwise operator FAQ.


    Quzah.
    Hope is the first step on the road to disappointment.

  4. #4
    C lover
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    This may help you out: Bitwise Operators in C

  5. #5
    Registered User
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    Code:
    Hi Syscal
    
    
    I have some doubts here.
    
    
    To set bit3 of variable a, 
    I used this way
    
    void set_bit3(void) // set bit 3 of a 
    {
    a |= BIT3;
    }
    
    
    Is it correcT?

  6. #6
    ATH0 quzah's Avatar
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    How about you write a small test program to find out? One that actually fully compiles and runs.


    Quzah.
    Hope is the first step on the road to disappointment.

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