Nested Loops
Concept, Syntax & Examples
What is a Loop?
• • A loop repeats a block of code
• • Used to save time and reduce code
• • Examples: for, while, do-while
What is a Nested Loop?
• • A loop inside another loop
• • Inner loop runs completely for each outer loop iteration
Why Use Nested Loops?
• • Work with tables & matrices
• • Pattern printing
• • Multi-dimensional data
General Syntax
• for i = 1 to n
• for j = 1 to m
• statement
• next j
• next i
Execution Flow
• • Outer loop runs first
• • Inner loop runs fully
• • Repeats until outer loop ends
Example (C++)
• for(int i=1;i<=3;i++)
• {
• for(int j=1;j<=2;j++)
• cout << j;
• }
Output Explanation
• • Inner loop runs 2 times
• • Outer loop runs 3 times
• • Total output = 6 times
Advantages & Disadvantages
• Advantages:
• • Powerful & flexible
• Disadvantages:
• • More time complexity
Conclusion
• • Nested loops are essential
• • Used in real-world programming
• • Practice improves understanding

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  • 1.
  • 2.
    What is aLoop? • • A loop repeats a block of code • • Used to save time and reduce code • • Examples: for, while, do-while
  • 3.
    What is aNested Loop? • • A loop inside another loop • • Inner loop runs completely for each outer loop iteration
  • 4.
    Why Use NestedLoops? • • Work with tables & matrices • • Pattern printing • • Multi-dimensional data
  • 5.
    General Syntax • fori = 1 to n • for j = 1 to m • statement • next j • next i
  • 6.
    Execution Flow • •Outer loop runs first • • Inner loop runs fully • • Repeats until outer loop ends
  • 7.
    Example (C++) • for(inti=1;i<=3;i++) • { • for(int j=1;j<=2;j++) • cout << j; • }
  • 8.
    Output Explanation • •Inner loop runs 2 times • • Outer loop runs 3 times • • Total output = 6 times
  • 9.
    Advantages & Disadvantages •Advantages: • • Powerful & flexible • Disadvantages: • • More time complexity
  • 10.
    Conclusion • • Nestedloops are essential • • Used in real-world programming • • Practice improves understanding