#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
int main(void)
{
int8_t n[8] = "98765432";
uint64_t* a = (uint64_t *)n;
*a =((*a & 0x0F000F000F000F00)>>8) +\
((*a & 0x000F000F000F000F)*10);
*a = 1000000 * ((*a >> 0 ) & 0xFF) +\
10000 * ((*a >> 16) & 0xFF) +\
100 * ((*a >> 32) & 0xFF) +\
((*a >> 48) & 0xFF);
//little-endian only. Можно переделать под big-endian
return 0;
}
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