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Loops in C

📘 C 👁 28 views 📅 Dec 22, 2025
⏱ Estimated reading time: 1 min

Loops are used to execute a block of code repeatedly as long as a specified condition is true.

Types of Loops in C

  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++) {
    printf("%d ", i);
}

2. while Loop

Used when the condition is checked before execution.

Syntax

while (condition) {
    statements;
}

Example

int i = 1;
while (i <= 5) {
    printf("%d ", i);
    i++;
}

3. do–while Loop

Used when the loop must execute at least once.

Syntax

do {
    statements;
} while (condition);

Example

int i = 1;
do {
    printf("%d ", i);
    i++;
} while (i <= 5);

Differences Between Loops

Featureforwhiledo–while
Condition checkBefore loopBefore loopAfter loop
Minimum execution0 times0 timesAt least 1 time
Use caseKnown countUnknown countExecute once minimum

Loop Control Statements

break

Terminates the loop.

break;

continue

Skips the current iteration.

continue;

Nested Loops

A loop inside another loop.

for (int i = 1; i <= 3; i++) {
    for (int j = 1; j <= 3; j++) {
        printf("* ");
    }
    printf("\n");
}

Summary

  • Loops repeat execution of statements

  • for loop is used for fixed iterations

  • while loop checks condition first

  • do–while loop executes at least once

  • break and continue control loop flow

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Control Statements in C
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Functions in C
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