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  • 用矩形法求定積分的通用函數(shù)

    時(shí)間:2020-11-21 17:39:02 筆試題目 我要投稿

    用矩形法求定積分的通用函數(shù)

      解: #include

      main()

      { float integral(float(8p)(float),float a,float b,int n);

      float a1,b1,a2,b2,a3,b3,c,(*p)(float);

      float fsin(float);

      float fcos(float);

      float fexp(float);

      int n=20;

      printf(“Input a1,b1:”);

      scanf(“%f,%f”,&a1,&b2);

      printf(“Input a2,b2:”);

      scanf(“%f,%f”,&a2,&b2);

      printf(“Input a3,b3:”);

      scanf(“%f,%f”,&a3,b3);

      p=fsin;

      c=integral(p,a1,b1,n);

      printf(“The integral of sin(x) is:%f\n”,c);

      p=fcos;

      c=integral(p,a2,b2,n);

      printf(“The integral of cos(x) is :%f\n”,c);

      c=integral(p,a3,b3,n);

      printf(“The integral of sin(x) is :%f\n”,c);

      }

      float integral(float (*p)(float),float a,float b,int n)

      {

      int i;

      floatx,h,s;

      h=(b-a)/n;

      x=a;

      s=0;

      for(i=1;i<=n;i++)

      {x=x+h;

      s=s+(*p)(x)*h;

      }

      return(s);

      }

      float fsin(float x)

      {return sin(x);}

      float fcos(float x)

      {return cos(x);}

      float fexp(float x)

      {return exp(x);}

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