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发表于 2022-3-2 14:38:35
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显示全部楼层
- #include <stdio.h>
- #include <stdint.h>
- void binary(char *buff, const void *data, size_t size) {
- if(!size) {*buff = '\0'; return;}
- uint8_t byte = *(const uint8_t *)&data[size - 1];
- for(size_t mask = 0x80; mask; mask >>= 1) {
- *buff++ = mask & byte ? '1': '0';
- }
- binary(buff, data, size - 1);
- }
- int main(void) {
- char buff[33];
- int a = 0x12345678;
- binary(buff, &a, sizeof(a));
- puts(buff);
- return 0;
- }
复制代码
- #include <stdio.h>
- #include <stdint.h>
- void binary(char *buff, const void *data, size_t size) {
- uint8_t byte = *(const uint8_t *)(data + size - 1);
- for(size_t mask = 0x80; mask; mask >>= 1) {
- *buff++ = mask & byte ? '1': '0';
- }
- if(size == 1) {*buff = '\0'; return;}
- *buff++ = '_'; binary(buff, data, size - 1);
- }
- int main(void) {
- // 7个'_'
- // 1个'\0'
- // sizeof(double) == 8
- // 8 * 8 + 8 = 72
- printf("sizeof(double) == %lu\n", sizeof(double));
- char buff[72];
- {
- char data = 0x12;
- binary(buff, &data, sizeof(data));
- printf("char:\t%s\n", buff);
- }
- {
- int data = 0x12345678;
- binary(buff, &data, sizeof(data));
- printf("int:\t%s\n", buff);
- }
- {
- float data = 123.456;
- binary(buff, &data, sizeof(data));
- printf("float:\t%s\n", buff);
- }
- {
- double data = 123.456789;
- binary(buff, &data, sizeof(data));
- printf("double:\t%s\n", buff);
- }
- return 0;
- }
复制代码
- $ ./main
- sizeof(double) == 8
- char: 00010010
- int: 00010010_00110100_01010110_01111000
- float: 01000010_11110110_11101001_01111001
- double: 01000000_01011110_11011101_00111100_00000111_11101110_00001011_00001011
- $
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