Mini Project

Relax. We'll talk through this in plain words — no textbook voice.

Time to bring everything you've learned together in one small project. This project stores 3 student scores and works out the total, average, and pass/fail result. It's a chance to practice variables, arrays, loops, functions, and if...else all in one place.

#include <stdio.h>

float calculateAverage(int scores[], int size) {
  int total = 0;

  for (int i = 0; i < size; i++) {
    total += scores[i];
  }

  return total / (float) size;
}

int main() {
  int scores[] = {75, 82, 68};
  int size = 3;
  float average = calculateAverage(scores, size);

  printf("Average score: %.2f
", average);

  if (average >= 60) {
    printf("Result: Passed");
  } else {
    printf("Result: Try again");
  }

  return 0;
}

calculateAverage() loops through the scores in the array, adds them up, and returns the average. In main(), that average is used to decide pass/fail with a condition.

You should see

Average score: 75.00 Result: Passed

Info

total / (float) size uses type casting so the result comes out as a decimal. Writing total / size alone does integer division, which drops the decimal part.

Easy traps

Hard-coding the array size too much can cause bugs once the number of scores changes. Later on, look into computing the size with sizeof(scores) / sizeof(scores[0]).