diff --git a/C/scratchpad/xorshift b/C/scratchpad/xorshift index bb1d7a19..552d370b 100755 Binary files a/C/scratchpad/xorshift and b/C/scratchpad/xorshift differ diff --git a/C/scratchpad/xorshift.c b/C/scratchpad/xorshift.c index 5457e6fa..e3b8ee81 100644 --- a/C/scratchpad/xorshift.c +++ b/C/scratchpad/xorshift.c @@ -2,34 +2,29 @@ #include #include -struct xorshift32_state { - uint32_t a; -}; - -uint32_t xorshift32(struct xorshift32_state *state) +uint32_t xorshift32(uint32_t* state) { /* Algorithm "xor" from p. 4 of Marsaglia, "Xorshift RNGs" */ - uint32_t x = state->a; + uint32_t x = *state; x ^= x << 13; x ^= x >> 17; x ^= x << 5; - return state->a = x; + return *state = x; } int main(){ - struct xorshift32_state** state = malloc(sizeof(struct xorshift32_state*) * 4); + uint32_t** states = malloc(4 * sizeof(uint32_t*)); for(int i=0; i<4;i++){ - state[i] = malloc(sizeof(struct xorshift32_state)); - state[i]->a = (uint32_t) i + 1; + states[i] = malloc(sizeof(uint32_t)); + *states[i] = i + 1; } - printf("%i\n", xorshift32(state[0])); - printf("%i\n", xorshift32(state[0])); + printf("%i\n", xorshift32(states[0])); + printf("%i\n", xorshift32(states[1])); for(int i=0; i<4;i++){ - free(state[i]); + free(states[i]); } - free(state); - + free(states); return 0; }