Code:

// input ASCII into input array
// check ASCII numeric range (0x30-0x39 & 0x2E) here, and subtract 0x30 for all but 0x2E
// rotate input array left until the decimal point is aligned with twopi array
unsigned int input = 100; // 2:45am cheat
unsigned char twopi[19] = { 0x00,0x00,0x00,0x06,0x02,0x08,0x03,0x01,0x08,0x05,0x03,0x00,0x07,0x01,0x07,0x09,0x05,0x09,0x00 };
unsigned char otput[19] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
int adcnt = 0; // counter
unsigned char dgcnt = 0; // digit index
unsigned char carry = 0; // carry digit
while (adcnt < input) { // multiply through addition
dgcnt = 17; carry = 0;
while (dgcnt > 0) { // cycle the digits
otput[dgcnt] = otput[dgcnt] + twopi[dgcnt] + carry; carry = 0;// add digit
if (otput[dgcnt] > 9) { otput[dgcnt] = otput[dgcnt] - 10; carry = 1; } // carry digit
dgcnt--;
} // dgcnt
if (carry != 0) { otput[dgcnt] = otput[dgcnt] + 1; }
adcnt++;
} // adcnt
twopi[18] = 0x00; // terminate string
printf("%d%d%d%d.%d%d%d%d%d%d",otput[0],otput[1],otput[2],otput[3],otput[4],otput[5],otput[6],otput[7],otput[8],otput[9]);
// answer: 1884.9555921538758

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