The following program is to be changed such that it uses arbitrary sized slices instead of fixed size arrays. In particular, the user entered size (variable sz) is to replace the hard-coded 32 in main and any function changed correspondingly.

package main import "fmt" import "math" import "math/rand" type Series struct { a, b float64 } func (s Series) add(t, TP int) float64 { return s.a*math.Sin(2.0*math.Pi*float64(t)/float64(TP)) + s.b*math.Cos(2.0*math.Pi*float64(t)/float64(TP)) } func fourier(c [32]Series, t, TP int) (res float64) { res = c[0].a for n := 1; n < 32; n++ { res += c[n].add(t, TP) } return } func main() { TP := 4 sz := 1 var res float64 // Enter size of fourier series fmt.Print("Size of series (1 ... 512): ") // Depending on your environment you may have to remove in the scanf _, err := fmt.Scanf("%d ", &sz) for err != nil || sz < 1 || sz > 512 { fmt.Println("Must be positive integer (1...512).") fmt.Println("Size of series (1 ... 512): ") _, err = fmt.Scanf("%d ", &sz) } fmt.Printf("Size: %d ", sz) var c [32]Series for t := 0; t < TP; t++ { for k := 0; k < 32; k++ { c[k].a = rand.Float64() c[k].b = rand.Float64() } res += fourier(c, t, TP) fmt.Printf("%f ", res) fmt.Println() } }