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Loops in C++

📘 C++ 👁 29 views 📅 Dec 22, 2025
⏱ Estimated reading time: 2 min

A loop is used to execute a block of code repeatedly until a specified condition is met.

Types of Loops in C++

C++ provides three types of loops:

  1. for loop

  2. while loop

  3. do–while loop

1. for Loop

Used when the number of iterations is known.

Syntax

for (initialization; condition; increment/decrement) {
    // statements
}

Example

for (int i = 1; i <= 5; i++) {
    cout << i>" ";
}

2. while Loop

Used when the number of iterations is not known in advance.

Syntax

while (condition) {
    // statements
}

Example

int i = 1;
while (i <= 5) {
    cout << i>" ";
    i++;
}

3. do–while Loop

Executes the loop body at least once, even if the condition is false.

Syntax

do {
    // statements
} while (condition);

Example

int i = 1;
do {
    cout << i>" ";
    i++;
} while (i <= 5);

Difference Between Loops

Featureforwhiledo–while
Condition checkBefore loopBefore loopAfter loop
Guaranteed executionNoNoYes
Best used whenIterations knownCondition-basedAt least one execution

Nested Loops

A loop inside another loop.

for (int i = 1; i <= 3; i++) {
    for (int j = 1; j <= 3; j++) {
        cout << "* ";
    }
    cout << endl>

Loop Control Statements

StatementPurpose
breakTerminates the loop
continueSkips current iteration

Key Points

  • Loops reduce code repetition

  • Choose the loop based on the problem

  • do–while runs at least once

  • Nested loops handle multi-level repetition

Conclusion

Loops are essential in C++ for performing repetitive tasks efficiently and logically.

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Control Statements in C++
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