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YTU 2421: C语言习题 矩形法求定积分

素的盐 2022-08-10 阅读 70


2421: C语言习题 矩形法求定积分


时间限制: 1 Sec   内存限制: 128 MB

提交: 354  

解决: 234


题目描述


写一个用矩形法求定积分的通用函数,分别求


 

(说明: sin,cos,exp已在系统的数学函数库中,程序开头要用#include<cmath>)。


输入


输入求sin(x) 定积分的下限和上限 
输入求cos(x) 定积分的下限和上限
输入求exp(x) 定积分的下限和上限


输出


求出sin(x)的定积分 
求出cos(x)的定积分 
求出exp(x)的定积分


样例输入

0 1
0 1
0 1

样例输出

The integral of sin(x) is :0.48
The integral of cos(x) is :0.83
The integral of exp(x) is :1.76

提示





主函数已给定如下,提交时不需要包含下述主函数


/* C代码 */  

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++代码 */

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;

}


迷失在幽谷中的鸟儿,独自飞翔在这偌大的天地间,却不知自己该飞往何方……


#include <stdio.h>
#include <math.h>
float integral(float (*p)(float),float a,float b,int n)
{
float s=0.0,i,w;
w=(b-a)/n;
for(i=a; i<=b; i+=w)
s+=p(i+w)*w;
return s;
}
float fsin(float a)
{
return sin(a);
}
float fcos(float a)
{
return cos(a);
}
float fexp(float a)
{
return exp(a);
}
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;
}


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