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Fundamental Data Types in C++

BY u6dwl
August 23, 2025
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Nesso Academy Lecture Summary

Introduction

Welcome to Nesso Academy. This lecture focuses on the fundamental data types available in C++. Previously, we covered the basics of data types, particularly the integer data type and its range.

Lecture Topics

  1. Introduction to Data Types

    • Data Type Definition: Describes the type and size of data a variable can hold.
    • Types of Data Types in C++:
      • Fundamental Data Types: Predefined and form the core of other data types.
      • User-defined Data Types: Defined by programmers (e.g., struct, class, enum).
      • Derived Data Types: Based on fundamental types (e.g., arrays, pointers).
  2. Fundamental Data Types Detail

    • int

      • Represents integers.
      • Size: 4 bytes (32 bits) with a range of -2147483648 to 2147483647.
      • Types: short int, int, long int, long long int, with signed and unsigned versions.
    • char

      • Represents characters enclosed in single quotes.
      • Size: 1 byte (8 bits).
      • Range: Signed (-128 to 127) and unsigned (0 to 255).
      • Internal representation is integer-based.
    • float

      • Represents floating point numbers with precision up to seven decimal digits.
      • Size: 4 bytes (32 bits).
      • Range: 1.17549E-38 to 3.40282E+38 for positive values.
    • double

      • Represents floating point numbers with precision up to 15 decimal digits.
      • Size: 8 bytes (64 bits).
      • Range: 2.2507E-308 to 1.79769E+308 for positive values.
    • bool

      • Represents true/false values.
      • Size: 1 byte (8 bits).
      • Used primarily in conditionals and loops.
    • void

      • Indicates absence of data or value.
      • Used mainly for functions and pointers to indicate no return value.

Conclusion

This lecture explained the fundamental data types within C++ in detail. We covered int, char, float, double, bool, and void data types along with their sizes, ranges, and applications. Thank you for attending the lecture, and we look forward to the next session.

Additional Notes

  • For character types, check the ASCII table for integer equivalents.
  • Understanding floating point number ranges requires knowledge from computer organization courses.
  • Compiler differences may affect whether char is signed or unsigned by default.

Stay tuned for upcoming lectures where we'll delve deeper into C++ programming concepts.

    Fundamental Data Types in C++