C Loops

#include <stdio.h>

int main() {
    // for loop — print 1 to 5
    printf("for loop:     ");
    for (int i = 1; i <= 5; i++) {
        printf("%d ", i);
    }
    printf("\n");

    // while loop — print 1 to 5
    printf("while loop:   ");
    int n = 1;
    while (n <= 5) {
        printf("%d ", n);
        n++;
    }
    printf("\n");

    // do-while loop — executes at least once
    printf("do-while:     ");
    int x = 1;
    do {
        printf("%d ", x);
        x++;
    } while (x <= 5);
    printf("\n");

    // do-while with false condition — still runs once
    printf("do-while (false condition): ");
    int y = 10;
    do {
        printf("%d ", y);  // prints 10 even though 10 > 5
    } while (y <= 5);
    printf("\n");

    return 0;
}

/*
Output:
for loop:     1 2 3 4 5
while loop:   1 2 3 4 5
do-while:     1 2 3 4 5
do-while (false condition): 10
*/

#include <stdio.h>

int main() {
    // Print 5x5 multiplication table
    printf("Multiplication Table (5x5):\n");
    for (int i = 1; i <= 5; i++) {
        for (int j = 1; j <= 5; j++) {
            printf("%4d", i * j);
        }
        printf("\n");
    }

    // Print a right triangle pattern
    printf("\nRight Triangle:\n");
    for (int i = 1; i <= 5; i++) {
        for (int j = 1; j <= i; j++) {
            printf("* ");
        }
        printf("\n");
    }

    return 0;
}

/*
Multiplication Table (5x5):
   1   2   3   4   5
   2   4   6   8  10
   3   6   9  12  15
   4   8  12  16  20
   5  10  15  20  25

Right Triangle:
*
* *
* * *
* * * *
* * * * *
*/

#include <stdio.h>

int main() {
    // break — exits the loop immediately
    printf("break (stop at 5): ");
    for (int i = 1; i <= 10; i++) {
        if (i == 6) break;
        printf("%d ", i);
    }
    printf("\n");

    // continue — skips current iteration, continues loop
    printf("continue (skip evens): ");
    for (int i = 1; i <= 10; i++) {
        if (i % 2 == 0) continue;
        printf("%d ", i);
    }
    printf("\n");

    // goto — jumps to a label (use sparingly!)
    int count = 0;
    loop_start:
        if (count < 5) {
            printf("goto count: %d\n", count);
            count++;
            goto loop_start;
        }

    printf("Done.\n");
    return 0;
}

/*
Output:
break (stop at 5): 1 2 3 4 5
continue (skip evens): 1 3 5 7 9
goto count: 0
goto count: 1
goto count: 2
goto count: 3
goto count: 4
Done.
*/