24 lines
491 B
C
24 lines
491 B
C
#include <math.h>
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#include <stdio.h>
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#define f(x) ((352 * x * x * x) - (64 * x * x) + (198 * x) - 36)
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double trapezoidal_integral(double a, double b, double n) {
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double h = (b - a) / n;
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double s = (f(a) + f(b)) / 2;
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// Add the other heights
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for (int i = 1; i < n; i++)
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s += f(a + i * h);
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return s * h;
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}
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int main() {
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printf("The area under the curve f(x) = 352x^3 - 64x^2 + 198x - 36 from x=3 "
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"to x=4 is %lf",
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trapezoidal_integral(3, 4, 10000));
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}
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