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chunli@chunli-Aspire-E1-471G:~/lab$ cat main.c #include "stdio.h" float SqrtByCarmack( float number ) { int i; float x2, y; const float threehalfs = 1.5F; x2 = number * 0.5F; y = number; i = * ( int * ) &y; i = 0x5f375a86 - ( i >> 1 ); y = * ( float * ) &i; y = y * ( threehalfs - ( x2 * y * y ) ); y = y * ( threehalfs - ( x2 * y * y ) ); y = y * ( threehalfs - ( x2 * y * y ) ); return number*y; } int main() { printf("%f\n", SqrtByCarmack(998001)); printf("%f\n", SqrtByCarmack(99.99998)); printf("%f\n", SqrtByCarmack(3025)); printf("%f\n", SqrtByCarmack(1)); printf("%f\n", SqrtByCarmack(1.21)); printf("%f\n", SqrtByCarmack(1.5129)); printf("%f\n", SqrtByCarmack(1.522756)); printf("%f\n", SqrtByCarmack(1.52399025)); printf("%f\n", SqrtByCarmack(1.52413839)); printf("%f\n", SqrtByCarmack(1.52415568)); return 0; } chunli@chunli-Aspire-E1-471G:~/lab$ gcc -Wall main.c && ./a.out 999.000000 9.999999 55.000000 1.000000 1.100000 1.230000 1.234000 1.234500 1.234560 1.234567 chunli@chunli-Aspire-E1-471G:~/lab$
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