#include
void main()
{
int a,b,n,l[n],i[n],s[15]={0};
printf("请输入起点距，河底高程，测点个数：");
scanf("%f£¬%f£¬%d",&l[n],&i[n],&n);
int A[n][15];
int h[15] = {742,752,762,772,782,792,802,812,822,832,842,852,862,872,882};
a>=1 && a<=15;
b>=1 && b<=n;
if(h[a]<=i[b],h[a]<=i[b+1])
A[b][a]=0;
else if(h[a]>=i[a],h[a]>=i[b+1])
A[b][a]=(l[b+1]-l[b])*(2*h[a]-i[b]-i[b+1])/2;
else if(h[a]<=i[b])
A[b][a]=(l[b+1]-l[b])*(h[a]-i[b+1])*(h[a]-i[b+1])/(i[b]-i[b+1])/2;
else
A[b][a]=(l[b+1]-l[b])*(h[a]-i[b])*(h[a]-i[b])/(i[b+1]-i[b])/2;
for (a= 0; a < n; a++);
{
s[a]=s[a]+A[b][a];
}
printf("过水断面面积s=%8.2f\n",s[a]);
}
提示错误有：
--------------------Configuration: ºÓµÀ¹ýË®¶ÏÃæÃæ»ý¼ÆËã2 - Win32 Debug--------------------
Compiling...
cpp(4) : error C2057: expected constant expression
cpp(4) : error C2466: cannot allocate an array of constant size 0
cpp(4) : error C2133: 'l' : unknown size
cpp(4) : error C2057: expected constant expression
cpp(4) : error C2466: cannot allocate an array of constant size 0
cpp(4) : error C2133: 'i' : unknown size
cpp(7) : error C2057: expected constant expression
cpp(7) : error C2466: cannot allocate an array of constant size 0
cpp(7) : error C2133: 'A' : unknown size
题目；已知河道纵断面（起点距l【n】，河底高程i【n】）求河道断面面积。n断面测点个数，if语句面积求法，主要问题，数组定义，数组引用
