主函式已給定如下，提交時不需要包含下述主函式



/* C程式碼 */

int main()

{

    float integral(float (*p)(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;

    scanf("%f%f",&a1,&b1);

    scanf("%f%f",&a2,&b2);

    scanf("%f%f",&a3,&b3);

    p=fsin;

    c=integral(p,a1,b1,n);

    printf("The integral of sin(x) is :%.2f\n",c);

    p=fcos;

    c=integral(p,a2,b2,n);

    printf("The integral of cos(x) is :%.2f\n",c);

    p=fexp;

    c=integral(p,a3,b3,n);

    printf("The integral of exp(x) is :%.2f\n",c);

    return 0;

}





/* C++程式碼 */

int main()

{

    float integral(float (*p)(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;

    cin>>a1>>b1;

    cin>>a2>>b2;

    cin>>a3>>b3;

    cout<<setiosflags(ios::fixed);

    cout<<setprecision(2);

    p=fsin;

    c=integral(p,a1,b1,n);

    cout<<"The integral of sin(x) is :"<<c<<endl;

    p=fcos;

    c=integral(p,a2,b2,n);

    cout<<"The integral of cos(x) is :"<<c<<endl;;

    p=fexp;

    c=integral(p,a3,b3,n);

    cout<<"The integral of exp(x) is :"<<c<<endl;

    return 0;

}