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“Series of 100 Essential Knowledge Points for C Language Beginners“

30. Summary of break and continue Usage Techniques: Loop Control Statements

1. Detailed Explanation of break Statement

1. Basic Function and Syntax

The break statement is used to immediately terminate the execution of the current loop or switch statement:

for (int i = 0; i < 10; i++) {
    if (i == 5) break;  // Exit the loop when i equals 5
    printf("%d ", i);
}
// Output: 0 1 2 3 4

2. break in Nested Loops

The break only affects the innermost loop:

for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 5; j++) {
        if (j == 2) break;  // Only exit the inner loop
        printf("%d-%d ", i, j);
    }
}
/* Output:
0-0 0-1 
1-0 1-1 
2-0 2-1 */

2. Detailed Explanation of continue Statement

Basic Syntax

The continue statement skips the remaining part of the current loop and directly proceeds to the next iteration:

for (int i = 0; i < 5; i++) {
    if (i == 2) continue;  // Skip the case when i=2
    printf("%d ", i);
}
// Output: 0 1 3 4

2. continue in while Loops

int i = 0;
while (i < 5) {
    i++;
    if (i == 3) continue;  // Skip but i has already incremented
    printf("%d ", i);
}
// Output: 1 2 4 5

3. Key Differences Comparison

Feature	break	continue
Loop Control	Completely terminates the loop	Skips the current iteration
Applicable Structures	Loops and switch	Only loop structures
Nested Loops	Affects only the innermost	Affects only the innermost

4. Common Mistakes

Infinite Loop Trap

int i = 0;
while (i < 10) {
    if (i == 5) continue;  // Skips i++ causing an infinite loop
    printf("%d ", i);
    i++;
}

Correction:

while (i < 10) {
    if (i == 5) { i++; continue; }
    printf("%d ", i++);
}

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Essential Knowledge Points for C Language Beginners: Summary of break and continue Usage Techniques

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