math - How to store three small numbers into one double? -


i have int a, b, c. , a in range 0-9999, b 0-99, c 0-99.

because function must return 1 double, think of putting them 1 number. otherwise need call function 3 times. cannot write efficient code this. called millions times, should quite effective, no asm.

i need function double pack3int_to_double(int a, int b, int c) {}

couldn't store + 1000b + 100000c?

for example, if wanted store = 1234, b = 6, , c = 89, you'd store

89061234 ccbaaaa

you can extract numbers casting double int , using standard integer division , modulus tricks recover individual values.

hope helps!


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