vault backup: 2025-01-07 18:14:44

education/computer engineering/ECE1400/Chapter 11 Exercises.md

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+> 1. If `i` is a variable and `p` points to `i`, which of the following expressions are aliases for `i`?
+
+a. `*p`
+g. `*&i`
+
+> 2. If `i` is an `int` variable and `p` and `q` are pointers to `int`, which of the following assignments are legal?
+
+e. `p = *&q;`
+f. `p = q;`
+i. `*p = *q`
+
+> 3. The following function supposedly computes the sum and average of the numbers in the array `a`, which has length `n`. `avg` and `sum` point to the variables that the function should modify, unfortunately the function contains several errors, find and correct them.
+
+```c
+void avg_sum(double a[], int n, double *avg, double *sum)
+{
+int i;
+
+// This was assigning a pointer to a float,
+// the dereference operator was missing
+*sum = 0.0;
+for (i = 0; i < n; i++)
+	// This wasn't increasing the value
+	// `sum` points to, it was modifying the address stored in the pointer
+	(*sum) += a[i];
+// Missing dereference operators
+*avg = *sum / n;
+
+}
+```