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32 lines
600 B
C
32 lines
600 B
C
#include <assert.h>
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#include <stdio.h>
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#include <stdbool.h>
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double approximate_pi(unsigned int steps) {
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double approximate_pi = 4.0;
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bool subtract = true;
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for (unsigned int i = 2; i <= steps; i++) {
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if (subtract) {
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approximate_pi -= (4.0 / (i * 2 - 1));
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} else {
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approximate_pi += (4.0 / (i * 2 - 1));
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}
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subtract = !subtract;
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}
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return approximate_pi;
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}
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int main(void) {
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// printf("sizeof(int) = %d\n", sizeof(int));
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double mypi = approximate_pi(100000000);
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printf("pi = %8.7f\n", mypi);
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assert(mypi > 3.141);
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assert(mypi < 3.142);
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return 0;
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}
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