Control Flow

Break and Continue

continue skips the rest of the current iteration, while break exits the loop.

continue `continue` jumps to the next loop iteration.
break `break` leaves the loop immediately.

Break and Continue

stop
break_continue.c
Replay: real traced execution (multi-file project)
#include <stdio.h>

int main(void) {
    int stop = 5;
    int total = 0;

    for (int i = 1; i <= 6; i++) {
        if (i == 2) {
            continue;
        }
        if (i == stop) {
            break;
        }
        total += i;
    }

    printf("total=%d\n", total);
    return 0;
}

#include <stdio.h>

int main(void) {
    int stop = 4;
    int total = 0;

    for (int i = 1; i <= 6; i++) {
        if (i == 2) {
            continue;
        }
        if (i == stop) {
            break;
        }
        total += i;
    }

    printf("total=%d\n", total);
    return 0;
}

#include <stdio.h>

int main(void) {
    int stop = 6;
    int total = 0;

    for (int i = 1; i <= 6; i++) {
        if (i == 2) {
            continue;
        }
        if (i == stop) {
            break;
        }
        total += i;
    }

    printf("total=%d\n", total);
    return 0;
}

  1. stop ← 5, total ← 0

    3int main(void) {4    int stop→ 5 = 5; //@stop=4, 65    int total→ 0 = 0;

  2. total ← 1

    pass 1 of 5
    7for (int i1 = 1; i <= 6; i++) {8    if (i == 2) {9        continue;10    }11    if (i == stop) {12        break;13    }14    total→ 1 += i1;15}
    All 5 passes — pass 1 is the card above
    passistoptotal
    11—0 → 1
    22——
    33—1 → 4
    44—4 → 8
    555—

  3. if (i == 2)

    7for (int i = 1; i <= 6; i++) {8    if (i2 == 2) {9        continue;10    }

  4. if (i == stop)

    10}11if (i5 == stop5) {12    break;13}

  5. printf("total=%d ", total);

    17    printf("total=%d\n", total8);18    return 0;19}
    outputtotal=8

  1. stop ← 4, total ← 0

    3int main(void) {4    int stop→ 4 = 4;5    int total→ 0 = 0;

  2. total ← 1

    pass 1 of 4
    7for (int i1 = 1; i <= 6; i++) {8    if (i == 2) {9        continue;10    }11    if (i == stop) {12        break;13    }14    total→ 1 += i1;15}
    All 4 passes — pass 1 is the card above
    passistoptotal
    11—0 → 1
    22——
    33—1 → 4
    444—

  3. if (i == 2)

    7for (int i = 1; i <= 6; i++) {8    if (i2 == 2) {9        continue;10    }

  4. if (i == stop)

    10}11if (i4 == stop4) {12    break;13}

  5. printf("total=%d ", total);

    17    printf("total=%d\n", total4);18    return 0;19}
    outputtotal=4

  1. stop ← 6, total ← 0

    3int main(void) {4    int stop→ 6 = 6;5    int total→ 0 = 0;

  2. total ← 1

    pass 1 of 6
    7for (int i1 = 1; i <= 6; i++) {8    if (i == 2) {9        continue;10    }11    if (i == stop) {12        break;13    }14    total→ 1 += i1;15}
    All 6 passes — pass 1 is the card above
    passistoptotal
    11—0 → 1
    22——
    33—1 → 4
    44—4 → 8
    55—8 → 13
    666—

  3. if (i == 2)

    7for (int i = 1; i <= 6; i++) {8    if (i2 == 2) {9        continue;10    }

  4. if (i == stop)

    10}11if (i6 == stop6) {12    break;13}

  5. printf("total=%d ", total);

    17    printf("total=%d\n", total13);18    return 0;19}
    outputtotal=13