break Statement in C

The break statement is used to exit a loop immediately.

break;

After executing break, control moves to the statement after the nearest enclosing loop.

break;

The break statement consists of the keyword break followed by a semicolon.

for (int i = 1; i <= 10; i++)
{
    if (i == 5)
    {
        break;
    }

    printf("%d ", i);
}

Output:

1 2 3 4

When i becomes 5, the break statement terminates the loop.

for (int i = 1; i <= 10; i++)
{
    printf("%d ", i);

    if (i == 5)
    {
        break;
    }
}

The loop stops immediately after printing 5.

int i = 1;

while (i <= 10)
{
    if (i == 5)
    {
        break;
    }

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

Output:

1 2 3 4

int i = 1;

do
{
    if (i == 5)
    {
        break;
    }

    printf("%d ", i);
    i++;
}
while (i <= 10);

The loop stops when i reaches 5.

The break statement is often placed inside an if statement.

for (int i = 1; i <= 10; i++)
{
    if (i > 5)
    {
        break;
    }

    printf("%d ", i);
}

The if condition decides when the loop should stop.

The break statement terminates only the nearest enclosing loop.

for (int i = 1; i <= 5; i++)
{
    if (i == 3)
    {
        break;
    }

    printf("%d ", i);
}

printf("\nProgram continues.");

Output:

1 2
Program continues.

A break statement can be used to terminate an intentionally infinite loop.

int i = 1;

while (1)
{
    printf("%d ", i);

    if (i == 5)
    {
        break;
    }

    i++;
}

The loop stops when i becomes 5.

int numbers[] = {10, 20, 30, 40, 50};
int target = 30;

for (int i = 0; i < 5; i++)
{
    if (numbers[i] == target)
    {
        printf("Number found!");
        break;
    }
}

Once the target is found, there is no need to continue searching.

int numbers[] = {4, 8, 12, 16, 20};
int target = 12;
int found = 0;

for (int i = 0; i < 5; i++)
{
    if (numbers[i] == target)
    {
        found = 1;
        break;
    }
}

if (found)
{
    printf("Found");
}
else
{
    printf("Not Found");
}

The break stops the search as soon as the target is found.

int number;

while (1)
{
    printf("Enter number: ");
    scanf("%d", &number);

    if (number == 0)
    {
        break;
    }

    printf("You entered %d\n", number);
}

The loop continues until the user enters 0.

int choice = 2;

switch (choice)
{
    case 1:
        printf("One");
        break;

    case 2:
        printf("Two");
        break;

    default:
        printf("Invalid choice");
}

In a switch, break is commonly used to prevent execution from continuing into the following cases.

int choice = 1;

switch (choice)
{
    case 1:
        printf("One\n");
        break;

    case 2:
        printf("Two\n");
        break;

    default:
        printf("Other");
}

When choice is 1, the program prints only One and then leaves the switch.

int number;

for (int i = 1; i <= 5; i++)
{
    printf("Enter number: ");
    scanf("%d", &number);

    if (number == 0)
    {
        break;
    }

    printf("Number = %d\n", number);
}

Entering 0 immediately terminates the loop.

for (int i = 1; i <= 20; i++)
{
    if (i % 7 == 0)
    {
        break;
    }

    printf("%d ", i);
}

Output:

1 2 3 4 5 6

The loop stops when it reaches the first multiple of 7.

char ch;

while (1)
{
    printf("Enter a character: ");
    scanf(" %c", &ch);

    if (ch == 'q')
    {
        break;
    }

    printf("You entered: %c\n", ch);
}

The loop terminates when the user enters q.

for (int i = 1; i <= 3; i++)
{
    for (int j = 1; j <= 5; j++)
    {
        if (j == 3)
        {
            break;
        }

        printf("%d ", j);
    }

    printf("\n");
}

The break exits the inner loop, not the outer loop.

When loops are nested, an ordinary break exits only the nearest enclosing loop.

for (int i = 1; i <= 3; i++)
{
    for (int j = 1; j <= 3; j++)
    {
        if (j == 2)
        {
            break;
        }

        printf("i=%d j=%d\n", i, j);
    }
}

The outer loop continues after the inner loop is terminated.

The break statement must be inside a loop or switch statement. It is not a general-purpose statement for exiting an if statement.

if (number == 5)
{
    printf("Number is 5");
}

An if statement itself does not require break.

Sometimes a loop can stop naturally through its condition, while break allows an early exit.

for (int i = 1; i <= 10; i++)
{
    if (i == 5)
    {
        break;
    }

    printf("%d ", i);
}

The normal condition allows values through 10, but break stops the loop earlier at 5.

int i = 1;

do
{
    printf("%d ", i);

    if (i == 5)
    {
        break;
    }

    i++;
}
while (i <= 10);

The loop terminates immediately when i reaches 5.

The position of break affects when the loop terminates.

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

    if (i == 3)
    {
        break;
    }
}

Output:

1 2 3

If the break appears before the printf(), 3 would not be printed.

If a case does not end with break, execution can continue into the next case when applicable.

switch (choice)
{
    case 1:
        printf("One\n");

    case 2:
        printf("Two\n");
        break;
}

When choice is 1, both messages can be printed because there is no break after case 1.

for (int i = 1; i <= 100; i++)
{
    if (i % 9 == 0)
    {
        printf("First divisible number = %d", i);
        break;
    }
}

The loop stops at the first number divisible by 9.

int numbers[] = {5, 8, 12, -4, 10};
int size = 5;

for (int i = 0; i < size; i++)
{
    if (numbers[i] < 0)
    {
        printf("First negative number = %d", numbers[i]);
        break;
    }
}

The loop stops as soon as the first negative number is found.

#include <stdio.h>

int main()
{
    int numbers[] = {10, 20, 30, 40, 50};
    int target;
    int found = 0;

    printf("Enter number to search: ");
    scanf("%d", &target);

    for (int i = 0; i < 5; i++)
    {
        if (numbers[i] == target)
        {
            found = 1;
            break;
        }
    }

    if (found)
    {
        printf("Number found.");
    }
    else
    {
        printf("Number not found.");
    }

    return 0;
}

#include <stdio.h>

int main()
{
    int number;

    while (1)
    {
        printf("Enter a number (0 to exit): ");
        scanf("%d", &number);

        if (number == 0)
        {
            break;
        }

        printf("Square = %d\n", number * number);
    }

    printf("Program ended.");

    return 0;
}

#include <stdio.h>

int main()
{
    int choice;

    while (1)
    {
        printf("\n1. Say Hello\n");
        printf("2. Show Message\n");
        printf("3. Exit\n");
        printf("Enter choice: ");
        scanf("%d", &choice);

        if (choice == 1)
        {
            printf("Hello!\n");
        }
        else if (choice == 2)
        {
            printf("Welcome to C programming!\n");
        }
        else if (choice == 3)
        {
            break;
        }
        else
        {
            printf("Invalid choice.\n");
        }
    }

    printf("Program ended.");

    return 0;
}

Here, break provides the exit from the otherwise continuous menu loop.

Practice the following programs:

1. Print numbers from 1 to 10 and stop at 5.
2. Print numbers from 1 to 100 and stop at the first multiple of 10.
3. Search for a number in an array using break.
4. Read numbers until the user enters 0.
5. Read characters until the user enters q.
6. Find the first negative number in an array.
7. Find the first number divisible by 7.
8. Create an infinite loop with a controlled exit.
9. Create a menu using break.
10. Use break inside a nested loop and observe which loop stops.

Practice these examples carefully to understand that break provides an immediate exit from the nearest enclosing loop or switch.