?? 梯形求積.cpp
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#include<iostream.h>
#include<iomanip.h>
double f1(double x){
return (1+x+2*x);
}
double f2(double x){
return(1+x+2*x*x+3*x*x*x);
}
double f3(double x){
return(1+x+2*x*x+3*x*x*x+4*x*x*x*x);
}
double integer(double(*fun)(double),double,double);
void main(){
double fi1,fi2,fi3;
fi1=integer(f1,0.0,3.0);
fi2=integer(f2,0.0,3.0);
fi3=integer(f3,0.0,3.0);
cout<<fi1<<'\n'<<fi2<<'\n'<<fi3<<'\n';
}
double integer(double(*fun)(double),double a,double b){
double re,step;
re=((*fun)(a)+(*fun)(b))/2;
step=(b-a)/100;
for(int i=1;i<100;i++)re+=(*fun)(a=i*step);
re*=step;
return re;
}
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