Example: matrix multiply

//a[ ][ ] and b[ ][ ] are n x n matrices; c = a x b

for (i=0; i<n; i++)

for (j=0; j< n; j++){

c[i][j] = 0.0;

for (k=0; k<n; k++)

c[i][j] += a[i][k] + b[k][j];

}

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