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Recursive Functions for CSE 240

Recursive Functions for CSE 240









Recursive Functions Across 20 Languages

A CSE 240 Companion for Your ASU Journey








Python

This function models how study time compounds. Each CSE 240 module builds on the last, so you might need more time as you go deeper. This function calculates the total study hours needed up to a certain module.

def calculate_study_hours(module_number):
# Base case: Module 1 takes a baseline of 3 hours.
if module_number == 1:
return 3
# Recursive step: Each subsequent module takes its number in hours,
# plus all the hours from previous modules.
else:
return module_number + calculate_study_hours(module_number - 1)

# How many hours for the first 4 modules?
print(calculate_study_hours(4)) # Output: 10 (4 + 3 + 2 + 1)






JavaScript

Imagine your course concepts are locked. You can only unlock the next one after understanding the current one. This function simulates "unlocking" concepts recursively until you've mastered them all.

function unlockConcept(currentConceptID, finalConceptID) {
// Base case: You've reached the final concept for the week.
if (currentConceptID >= finalConceptID) {
console.log(`Concept ${finalConceptID} mastered! Module complete.`);
return;
}

// Recursive step: Study the current concept and move to the next.
console.log(`Studying concept ${currentConceptID}...`);
unlockConcept(currentConceptID + 1, finalConceptID);
}

unlockConcept(1, 5);






C

In C, you'll master pointers. This function simulates recursively "dereferencing" a pointer. Each call goes one level deeper into memory, like peeling layers of an onion, until it reaches the base value.

#include <stdio.h>

// Imagine this function traces memory addresses.
void trace_pointer(int pointer_level) {
// Base case: We've reached the actual data.
if (pointer_level <= 0) {
printf("Reached the value!\\n");
return;
}

// Recursive step: "Dereference" and go to the next level.
printf("Level %d pointer -> \\n", pointer_level);
trace_pointer(pointer_level - 1);
}

int main() {
trace_pointer(3); // Simulate a pointer-to-pointer-to-int (int***)
return 0;
}






C++

A C++ project is made of many files. The compiler processes them one by one.…