void* decQuadLog10 (void* _0, const void* _1, decContext* ctx) noexcept
{
decNumber _0num;
decNumber _1num;
decQuadToNumber (_1, &_1num);
decNumberLog10 (&_0num, &_1num, ctx);
return decQuadFromNumber (_0, &_0num, ctx);
}
void* decQuadPower (void* _0, const void* _1, const void* _2, decContext* ctx) noexcept
{
decNumber _0num;
decNumber _1num;
decNumber _2num;
decQuadToNumber (_1, &_1num);
decQuadToNumber (_2, &_2num);
decNumberPower (&_0num, &_1num, &_2num, ctx);
return decQuadFromNumber (_0, &_0num, ctx);
}
int main(int argc, char *argv[]) {
decQuad a; // working decQuad
decNumber numa, numb; // working decNumbers
decContext set; // working context
char string[DECQUAD_String]; // number->string buffer
if (argc<3) { // not enough words
printf("Please supply two numbers for power(2*a, b).\n");
return 1;
}
decContextDefault(&set, DEC_INIT_DECQUAD); // initialize
decQuadFromString(&a, argv[1], &set); // get a
decQuadAdd(&a, &a, &a, &set); // double a
decQuadToNumber(&a, &numa); // convert to decNumber
decNumberFromString(&numb, argv[2], &set);
decNumberPower(&numa, &numa, &numb, &set); // numa=numa**numb
decQuadFromNumber(&a, &numa, &set); // back via a Quad
decQuadToString(&a, string); // ..
printf("power(2*%s, %s) => %s\n", argv[1], argv[2], string);
return 0;
} // main