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#2
first_love2007-12-01 15:02
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#include "iostream.h"
#include "stdlib.h"
#define N 12
void process(float *p,int n,float (*fun)());
/*float arr_sum(float arr[],int n)
{
int i;
float sum=0;
for(i=0;i<n;i++)
sum+=arr[i];
cout<<"数组和为:";
return(sum);
}*/
void process(float *p,int n,float (*fun)(float *p,int n)) //调用功能函数
{
float result;
result = (*fun)(p,n);
cout<<result<<endl;
return ;
}
float arr_odd(float *p,int n)
{
int i;
float sum=0;
for(i=0;i<n;i+=2,p+=2) //这个地方值得自己好好学习
sum+=*p;
cout<<"奇数和:";
return(sum);
}
/*float arr_max(float *p,int n)
{
int i;
float m;
m = *p;
for(i=0;i<n;i++,p++)
if(*p>m) m = *p;
cout<<"最大值为:";
return(m);
}
float arr_ave(float *p,int n)
{
int i;
float a;
for(i=0;i<n;i++,p++)
a+=*p;
a=a/n;
cout<<"平均值为:";
return(a);
}*/
void main()
{
int i;
float a[N];
cout<<"输入要选课的系统:";
for(i=0;i<N;i++)
cin>>a[i];
float arr_odd(),(*pt)(float *p,int n);
int n = N;
pt = arr_odd();
process(a,n,pt);
//process(a,N,arr_odd);
//process(a,N,arr_max);
//process(a,N,arr_ave);
}
Compiling...
21function.cpp
D:\c++\book\21function\21function.cpp(20) : error C2197: 'float (__cdecl *)(void)' : too many actual parameters
D:\c++\book\21function\21function.cpp(68) : error C2440: '=' : cannot convert from 'float' to 'float (__cdecl *)(void)'
There is no context in which this conversion is possible
D:\c++\book\21function\21function.cpp(71) : error C2664: 'process' : cannot convert parameter 3 from 'float (float *,int)' to 'float (__cdecl *)(void)'
None of the functions with this name in scope match the target type
D:\c++\book\21function\21function.cpp(72) : error C2664: 'process' : cannot convert parameter 3 from 'float (float *,int)' to 'float (__cdecl *)(void)'
None of the functions with this name in scope match the target type
执行 cl.exe 时出错.
那位仁兄帮忙看一下，小弟真实感激不尽啊！