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#include <stdio.h>
#include <inttypes.h>
#include <string.h>
// endian dependend
#define PUT3(a,b,c) (((uint64_t)a<<8*0) | ((uint64_t)b<<8*1) | ((uint64_t)c<<8*2))
void testswitch(uint64_t x)
{
switch (x)
{
case PUT3('a','b','c'): printf("abc\n");
break;
case PUT3('d','e','f'): printf("def\n");
break;
case PUT3('g','h','i'): printf("ghi\n");
break;
default: printf("Choice other than abc, def and ghi\n");
break;
}
}
int main()
{
uint64_t x = 0;
char a[] = "abc";
memcpy(&x, a, sizeof(a)-1);
testswitch(x);
char b[] = "def";
memcpy(&x, b, sizeof(a)-1);
testswitch(x);
char c[] = "ghi";
memcpy(&x, c, sizeof(a)-1);
testswitch(x);
return 0;
}
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