34 lines
582 B
C
34 lines
582 B
C
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/* Driver for routine qsimp */
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#include <stdio.h>
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#include <math.h>
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#define NRANSI
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#include "nr.h"
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#define PIO2 1.5707963
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/* Test function */
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float func(float x)
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{
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return x*x*(x*x-2.0)*sin(x);
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}
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/* Integral of test function */
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float fint(float x)
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{
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return 4.0*x*(x*x-7.0)*sin(x)-(pow(x,4.0)-14.0*x*x+28.0)*cos(x);
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}
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int main(void)
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{
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float a=0.0,b=PIO2,s;
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printf("Integral of func computed with QSIMP\n\n");
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printf("Actual value of integral is %12.6f\n",fint(b)-fint(a));
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s=qsimp(func,a,b);
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printf("Result from routine QSIMP is %11.6f\n",s);
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return 0;
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}
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#undef NRANSI
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