Summation in C

[galaxianape]

Please help me with summation in C lang.

I m trying to divide the summation of alpha * delta with summation of alpha
this is half the program that i have written...but it gives error. pls help..

This is my program, it says invalid indirection in function main ]

i haved use stdio.h and math.h

 main ()
{
float del1, del2,deli,delj,deln, alpha;
int j,vi,i;
int sum=0;
 
printf ("provide alpha");
scanf .......
 
for (j=1;j<=vi;j++)
sum += alpha [i][j] *deln [j];
 
}

[gpraghuram]

What errors you are getting?

Raghu

[boxfish]

You are using alpha as an array, but it is just a float. To make it an array, either declare it as a static array, like this:
float alpha[someSize];

Or as a dynamic array, like this:
float *alpha;
If you declare it as a dynamic array, you will have to allocate memory for it before you use it and free the memory when you are done with it.

Hope this helps.