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Link: http://codepad.org/Y8hbvebb    [ raw code | output | fork ]

C, pasted on Nov 9: 
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#include <stdio.h>

int main()
{
    int var_old = 0x55;
    int var_new = 0xAA;

    printf("\n%02X    %02X",var_old,var_new);

    var_old &= ~(1<<0);         // erst löschen
    var_old |= var_new&(1<<0);  // ggfs wieder setzen

    printf("\n%02X    %02X",var_old,var_new);

    return 0;
}


Output: 
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55    AA
54    AA


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