Challenge 1 - Combined program

Write a program combining variables, loops and functions.

Challenge: grade statistics

You will combine variables, loops and functions. Write istatistik(notlar []int) (float64, int, int), which finds a grade list's average, highest grade and number of passing students (60 and above).

ort, enYuksek, gecen := istatistik([]int{45, 72, 90, 60, 38})
// 61 90 3

For an empty list all three values must be 0; don't forget division by zero.

Plan

1) If len(notlar) == 0, return 0, 0, 0. 2) Declare toplam, enYuksek := notlar[0] and gecen. 3) Walk with range: sum, update the highest grade and count 60 and above. 4) Compute the average with float64(toplam) / float64(len(notlar)) and return the three values.

Exercise Statistics function

Write the istatistik function following the plan. Print the results for []int{45, 72, 90, 60, 38} and an empty slice on separate lines.

Show example solution

package main

import "fmt"

func istatistik(notlar []int) (float64, int, int) {
    if len(notlar) == 0 {
        return 0, 0, 0
    }
    toplam, enYuksek, gecen := 0, notlar[0], 0
    for _, n := range notlar {
        toplam += n
        if n > enYuksek {
            enYuksek = n
        }
        if n >= 60 {
            gecen++
        }
    }
    return float64(toplam) / float64(len(notlar)), enYuksek, gecen
}

func main() {
    fmt.Println(istatistik([]int{45, 72, 90, 60, 38}))
    fmt.Println(istatistik(nil))
}

Test yourself

Why is the empty-list check done at the very start of the function?
- The average divides by len(notlar); dividing by 0 produces NaN
- Because it's shorter
- Go requires it
- It isn't needed
Show answer

The average divides by len(notlar); dividing by 0 produces NaN — float64(0)/float64(0) gives NaN; an early return handles this edge case cleanly.

Update the highest grade

for _, n := range notlar {
    if n ____ enYuksek {
        enYuksek = n
    }
}

Show answer

for _, n := range notlar {
    if n > enYuksek {
        enYuksek = n
    }
}

Input and result

[45 72 90 60 38]

61 90 3
[]

0 0 0
[100]

100 100 1
[59 59]

59 59 0

Next lesson: Challenge 2 - Data structure

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