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#include <stdio.h> #include <math.h> #define N 10 double fact[N]; double test_exp(double x) { int i; double sum = x; /* powers of x */ double xp[N]; xp[1] = x; for (i = 2; i < N; ++i) xp[i] = xp[i - 1] * x; /* sum */ for (i = N - 1; i; --i) sum += xp[i] / fact[i]; return sum; } int main() { int i; /* fill fact */ fact[0] = 1.0; for (i = 1; i < N; ++i) fact[i] = fact[i - 1] * (double)i; /* test exp */ printf("%f", exp(1.0) - test_exp(1.0)); return 0; }
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