Exercise: Conditional Expressions

Author: sleaper

exercises/25_conditional_expressions/README.md

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+# Conditional expressions
+
+For more information please refer to Chapter 2.11 of "The C Programming Language".

exercises/25_conditional_expressions/conditional_expressions_01.c

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+/*
+ * Rewrite the `to_upper` function from the previous exercise without using an `if` statement.
+ * Instead, use a conditional (ternary) expression.
+ *
+ * A conditional expression looks like this:
+ * condition ? value_if_true : value_if_false
+ *
+ * For example:
+ * z = (a > b) ? a : b;
+ *
+ * In this example, if `a` is greater than `b`, then `z` will be assigned the value of `a`.
+ * Otherwise, `z` will be assigned the value of `b`.
+ *
+ * Conditional expressions can sometimes make the code easier to read.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+// ❌ I AM NOT DONE
+
+char to_upper(char c) {
+	// Rewrite
+	if(c >= 'a' && c <= 'z') {
+		return c - 32;
+	}
+
+	return c;
+	// Rewrite
+}
+
+int main() {
+    char s[] = "hello, world!";
+
+    for(int i = 0, len = strlen(s); i < len; i++) {
+	s[i] = to_upper(s[i]);
+    }
+
+    printf("%s\n", s);
+
+    assert(strcmp(s, "HELLO, WORLD!") == 0);
+    return 0;
+}