kdeng00
105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/*
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*
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* This program briefly demonstrates usage of bitwise operators.
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*
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* Author: Kun Deng
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*
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*/
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#include <stdio.h>
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int main()
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{
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// 500 in binary is 111110100
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int n = 500;
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printf("n is %d\n", n);
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int n_temp = n;
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// Octal value 0177 is 127 in numerical form or 001111111 in binary
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int nb = 0177;
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// The result is 116 or 001110100 in binary
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// Bits are compared and if both aren't on then they get turned off
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// 500 - 111110100
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// 127 - 001111111
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// ---------------
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// 116 - 001110100
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n = n & nb;
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printf("%d & 0177 = %d\n", n_temp, n);
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n = n_temp;
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// 63 in binary is 0111111
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int nc = 63;
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// The result is 511 or 111111111 in binary
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// Bits are compared and if any are on then the result gets turned on
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// 500 - 111110100
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// 63 - 111111
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// ---------------
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// 511 - 111111111
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n = n | nc;
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printf("%d | %d = %d\n", n_temp, nc, n);
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n = n_temp;
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// The result is 459 or 111111111 in binary
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// Bits are compared and if they differ then they are turned on. If
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// they are the same then they are turned off
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// 500 - 111110100
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// 63 - 111111
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// ---------------
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// 459 - 111001011
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n = n ^ nc;
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printf("%d ^ %d = %d\n", n_temp, nc, n);
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n = n_temp;
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// 6 is 110 in binary
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int nd = 6;
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// The result is 32000 or 111110100000000 in binary
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// The bits were shifted left by 6 positions and the vacancies
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// were populated with zeros
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// 500 - 111110100
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// 6 - 110
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// -----------------------
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// 32000 - 111110100000000
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n = n << nd;
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printf("%d << %d = %d\n", n_temp, nd, n);
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n = n_temp;
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// 3 is 11 in binary
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int ne = 3;
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// The result is 62 or 111110 in binary
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// The bits were shifted right by 3 positions
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// 500 - 111110100
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// 3 - 11
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// -----------------------
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// 62 - 111110
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n = n >> ne;
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printf("%d >> %d = %d\n", n_temp, ne, n);
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n = n_temp;
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// Octal value 025 is 21 in numerical form and 10101 in binary
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int nf = 025;
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// The result is 480 or 111110000 in binary
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// After the one's complement of octal value 025 was taken,
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// the one's complement of that was compared with 500, bit by
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// bit. When bits didn't match, they got turned off.
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// 500 - 111110100
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// ~21 - 1010
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// -----------------------
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// 480 - 111110000
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n = n & ~nf;
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printf("%d & ~025 = %d\n", n_temp, n);
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return 0;
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}
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