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34 lines
598 B
C
34 lines
598 B
C
#include<conio.h>
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#include<stdio.h>
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#include<math.h>
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float f(float x)
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{
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return 1.0+x*x*x;
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}
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void main()
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{
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int i,n;
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float a,b,h,x,s2,s3,sum,integral;
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printf("enter the lower limit of the integration");
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sacnf("%f",&a);
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printf("enter the upper limit of the integration");
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sacnf("%f",&b);
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printf("enter the number of intervals");
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sacnf("%d",&n);
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h=(b-a)/n;
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sum=f(a)+f(b);
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s2=s3=0.0;
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for(i=1;i<n;i+=3)
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{
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x=a+i*h;
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s3=s3+f(x)+f(x+h);
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}
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for(i=3;i<n;i+=3)
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{
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x=a+i*h;
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s2=s2+f(x);
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}
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intgral=(h/3.0)*(sum+2*s2+4*s3);
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printf("\nvalue of the integral =%9.4f\n",integral);
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getch();
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} |