38 lines
588 B
C
38 lines
588 B
C
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/* Driver for routine midpnt */
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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 NMAX 10
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/* Test function */
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float func(float x)
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{
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return 1.0/sqrt(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 2.0*sqrt(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=1.0,s;
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int i;
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printf("\nIntegral of func computed with MIDPNT\n");
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printf("Actual value of integral is %7.4f\n",(fint(b)-fint(a)));
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printf("%6s %29s \n","n","Approx. integral");
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for (i=1;i<=NMAX;i++) {
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s=midpnt(func,a,b,i);
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printf("%6d %24.6f\n",i,s);
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}
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return 0;
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}
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#undef NRANSI
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