💻 C++ Output Numbers – Advanced Guide

In C++ Output Numbers are printed using cout.
At an advanced level, this includes formatting, precision control, bases, expressions, loops, and calculations.

1️⃣ Printing Integer Numbers ⭐

Example

Output

2️⃣ Printing Multiple Numbers in One Statement ⭐

Output

3️⃣ Printing Arithmetic Expressions ⭐

Output

4️⃣ Integer vs Floating-Point Output ⚠️

Output

📌 Integer division removes decimal part.

5️⃣ Printing Floating Numbers with Precision ⭐⭐

Output

6️⃣ Printing Numbers Using Loops ⭐

Print numbers from 1 to 5

Output

7️⃣ Printing Even and Odd Numbers ⭐

Even Numbers

Output

Odd Numbers

Output

8️⃣ Printing Numbers in Different Number Systems ⭐⭐⭐

Output

📌

• oct → octal

• hex → hexadecimal

9️⃣ Formatting Output Width ⭐⭐

Output

📌 Right-aligned by default.

🔟 Printing Calculated Results ⭐

Output

1️⃣1️⃣ Scientific Notation Output ⭐⭐⭐

Output

1️⃣2️⃣ Common Output Mistakes ❌

❌ Using cout >> instead of cout <<
❌ Forgetting #include <iomanip>
❌ Expecting decimal output from integer division
❌ Missing semicolon ;

📌 Interview Questions (Advanced)

Q1. Why does 5/2 print 2 in C++?
👉 Because both operands are integers.

Q2. How to control decimal precision?
👉 fixed + setprecision()

Q3. Which header is required for output formatting?
👉 <iomanip>

✅ Final Summary

✔ cout prints numbers
✔ Expressions are evaluated before printing
✔ Integer division removes decimals
✔ setprecision() controls decimals
✔ Loops print number sequences
✔ Bases: decimal, octal, hex
✔ Formatting is crucial in exams & interviews