CODEWITHSUNDEEP
c
Lutfi Rahmatullah
Lutfi Rahmatullah

Reputation: 55

Invalid operands to binary / on two-dimensional array

I have a variable which is declared using a 'typedef' data type and it has array. when i do a operation divide (/) it says invalid operations. this is the code sample :

const int n = 10;
typedef float matriks[100][100];
typedef float vektor[100];

matriks A;
vektor b;
vektor x;
void Sulih_Mundur (matriks A, vektor b, int n, vektor x){
int j,k;
        float sigma;
        x[n]=b[n]/A[n,n]; //error here
        for(k=n-1;k<1;k--){
            sigma=0;
            for(j=k+1;j>=n;j++){
                sigma=sigma+A[k,j]*x[j];
            }
            x[k]=(b[k]-sigma)/A[k,k];
        }
}

i got error on x[n]=b[n]/A[n,n] it says invalid operands / to binary (have float and float) i dont understand which one is the problem because i used the same data types there. and one integer variabel to access the array. thank you...

Upvotes: 2

Views: 136

Answers (1)

dbush
dbush

Reputation: 223872

x[n]=b[n]/A[n,n];

This is not the proper syntax for indexing a 2D array. The , here is actually the comma operator, which discards the left operand and evaluates to the right operand, so A[n,n] is the same as A[n]. So then you're attempting to assign a 1D array of float to a float which is the error you're getting.

What you want is:

x[n]=b[n]/A[n][n];

Do the same for other references of A.

Upvotes: 4

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