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38 lines
738 B
38 lines
738 B
#include <stdio.h>
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unsigned setbits(unsigned x, int p, int n, unsigned y);
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void printfbit(unsigned n);
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int main()
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{
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printf("76543210\n\n");
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unsigned c1 = 'f';
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printfbit(c1);
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unsigned c2 = 'z';
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printfbit(c2);
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printfbit(setbits(c1, 5, 3, c2));
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return 0;
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}
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/* setbits: x получает n правых бит из y, начиная с p-й позиции */
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unsigned setbits(unsigned x, int p, int n, unsigned y)
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{
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return ( (~0 << (p+1)) & x ) | ( ~(~0 << (p+1-n)) & x ) |
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(~(~0 << n) & y) << (p+1-n);
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}
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void printfbit(unsigned n)
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{
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for(int i = 7; i >= 0; i--)
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{
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if(n & (1 << i))
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putchar('1');
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else
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putchar('0');
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}
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putchar('\n');
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} |