C语言使用位操作显示二进制 C语言二进制位运算实例 C语言定义并使用字段 C语言使用位操作显示二进制 /* invert4.c -- using bit operations to display binary */ #include <stdio.h> #include <limits.h> char * itobs(int, char *); void show_bstr(const char *); int invert_end(int num, int bits); int main(void) { char bin_str[CHAR_BIT * sizeof(int) + 1]; int number; puts("Enter integers and see them in binary."); puts("Non-numeric input terminates program."); while (scanf("%d", &number) == 1) { itobs(number,bin_str); printf("%d is\n", number); show_bstr(bin_str); putchar('\n'); number = invert_end(number, 4); printf("Inverting the last 4 bits gives\n"); show_bstr(itobs(number,bin_str)); putchar('\n'); } puts("Bye!"); return 0; } char * itobs(int n, char * ps) { int i; const static int size = CHAR_BIT * sizeof(int); for (i = size - 1; i >= 0; i--, n >>= 1) ps[i] = (01 & n) + '0'; ps[size] = '\0'; return ps; } /* show binary string in blocks of 4 */ void show_bstr(const char * str) { int i = 0; while (str[i]) /* not the null character */ { putchar(str[i]); if(++i % 4 == 0 && str[i]) putchar(' '); } } int invert_end(int num, int bits) { int mask = 0; int bitval = 1; while (bits-- > 0) { mask |= bitval; bitval <<= 1; } return num ^ mask; } C语言二进制位运算实例 C语言定义并使用字段