double CountSum(double **mat, int i, int j)
{
   double sum = 0.0;
   for(i = 0; i < (R-1) / 2; i  )
   { 
     for(j = 0; j < (C-1) / 2; j  )
     { 

         sum  = mat[i][j];
     }
   }
   return sum;
}

Am I correct do this, or where I have mistakes? Or if you have some piece of advice on how to pass parameters to function, please tell me about that

CodePudding user response：

Assuming R and C are number of rows and number of columns respectively, this code won't work.

If R = 2 then (R - 1) / 2 = 0 so the outer loop won't be executed, because i < 0 is always false.

Don't subtract one, R / 2 would be enough. There are corner cases though, when R and C aren't even.

About parameters: you can add R and C to parameter list instead of i and j. (double **mat, int R, int C) and pass them respectively. From this current code, it looks like they are just global variables. i and j can be declared inside the function.

CodePudding user response：

First, why are you passing i and j in CountSum() ? You set it after , in for loop.

After that you should look your for loops when R = 1 or R = 2 you will not enter to the loop.

Finally in C/C when you pass array pointer you should pass two parameters more, this parameters are the dimensions of the array.