37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
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/* Streaming usage example for the Wickra C ABI.
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*
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* The same five-function shape (new / update / batch / reset / free) drives every
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* scalar indicator. Here an EMA consumes a live tick stream one value at a time;
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* `update` is O(1) per tick and returns NaN until the indicator has warmed up.
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*
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* Build (after `cargo build -p wickra-c --release`):
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* cc examples/c/streaming.c -I bindings/c/include -L target/release -lwickra -lm -o streaming
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*/
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#include "wickra.h"
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#include <stdio.h>
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int main(void) {
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struct Ema *ema = wickra_ema_new(5);
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if (ema == NULL) {
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fprintf(stderr, "failed to create EMA\n");
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return 1;
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}
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const double prices[] = {10.0, 10.5, 11.0, 10.8, 11.2, 11.5, 11.3, 11.8};
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const size_t n = sizeof(prices) / sizeof(prices[0]);
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printf("EMA(5) streaming:\n");
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for (size_t i = 0; i < n; ++i) {
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double value = wickra_ema_update(ema, prices[i]);
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if (value != value) { /* NaN during warmup */
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printf(" tick %zu price %.2f -> (warming up)\n", i, prices[i]);
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} else {
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printf(" tick %zu price %.2f -> %.4f\n", i, prices[i], value);
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}
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}
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wickra_ema_free(ema);
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return 0;
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}
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