sx/examples/0027-basic-control-flow.sx

#import "modules/std.sx";
#import "modules/math/math.sx";
#import "modules/compiler.sx";
#import "modules/test.sx";
pkg :: #import "modules/testpkg";

main :: () {

    // ========================================================
    // 4. CONTROL FLOW
    // ========================================================
    print("=== 4. Control Flow ===\n");

    // If-then-else (inline, as expression)
    ite := if true then 1 else 2;
    print("ite: {}\n", ite);

    // If-then-else both branches
    ie_a := if true then 10 else 20;
    ie_b := if false then 10 else 20;
    print("ite-both: {} {}\n", ie_a, ie_b);

    // If block
    if 1 < 2 {
        print("if-block: yes\n");
    }

    // If without else (statement)
    if false { print("should-not-print\n"); }
    print("if-no-else: after\n");

    // Nested if
    nx := 10;
    if nx > 5 {
        if nx > 8 {
            print("nested-if: deep\n");
        }
    }

    // If-else-if chain
    eiv := 2;
    if eiv == 1 {
        print("if-else-if: first\n");
    } else if eiv == 2 {
        print("if-else-if: second\n");
    } else {
        print("if-else-if: other\n");
    }

    // If block as expression
    ibe := 10 + if true { 5; } else { 0; };
    print("if-block-expr: {}\n", ibe);

    // While basic
    wi := 0;
    while wi < 5 { wi += 1; }
    print("while: {}\n", wi);

    // While with false condition (never executes)
    while false { print("should-not-print\n"); }
    print("while-false: skipped\n");

    // While with break
    wb := 0;
    while wb < 100 {
        if wb == 7 { break; }
        wb += 1;
    }
    print("while-break: {}\n", wb);

    // While with continue
    wsum := 0;
    wc := 0;
    while wc < 10 {
        wc += 1;
        if wc % 2 == 0 { continue; }
        wsum += wc;
    }
    print("while-continue: {}\n", wsum);

    // While sum 1..10
    wsum2 := 0;
    wi2 := 1;
    while wi2 <= 10 {
        wsum2 += wi2;
        wi2 += 1;
    }
    print("while-sum: {}\n", wsum2);

    // Nested while
    nw_outer := 0;
    nw_count := 0;
    while nw_outer < 3 {
        nw_inner := 0;
        while nw_inner < 3 {
            nw_count += 1;
            nw_inner += 1;
        }
        nw_outer += 1;
    }
    print("nested-while: {}\n", nw_count);

    // Nested while with break in inner
    nb_outer := 0;
    nb_icount := 0;
    while nb_outer < 5 {
        nb_i := 0;
        while nb_i < 5 {
            if nb_i == 1 { break; }
            nb_i += 1;
        }
        nb_icount += nb_i;
        nb_outer += 1;
        if nb_outer == 2 { break; }
    }
    print("nested-break: {} {}\n", nb_outer, nb_icount);

    // For loop basic
    farr : [4]s32 = .[10, 20, 30, 40];
    out("for:");
    for farr: (it) {
        out(" ");
        out(int_to_string(it));
    }
    out("\n");

    // For with print
    out("for-print:");
    for farr: (it) {
        print(" {}", it);
    }
    out("\n");

    // For with index
    out("for-idx:");
    for farr: (_, ix) {
        out(" ");
        out(int_to_string(ix));
    }
    out("\n");

    // For with print two args
    out("for-2arg:");
    for farr: (it, ix) {
        print(" {}@{}", it, ix);
    }
    out("\n");

    // For with break
    out("for-break:");
    for farr: (it) {
        if it == 30 { break; }
        print(" {}", it);
    }
    out("\n");

    // For with continue
    out("for-continue:");
    for farr: (it) {
        if it == 20 { continue; }
        print(" {}", it);
    }
    out("\n");

    // For on slice
    fsl : []s32 = .[10, 20, 30];
    out("for-slice:");
    for fsl: (it) {
        print(" {}", it);
    }
    out("\n");

    // For on slice with index
    out("for-slice-idx:");
    for fsl: (it, ix) {
        print(" {}:{}", ix, it);
    }
    out("\n");

    // Nested for
    nf_a : [2]s32 = .[0, 1];
    nf_b : [2]s32 = .[0, 1];
    out("for-nested:");
    for nf_a: (oa) {
        for nf_b: (ob) {
            print(" ({},{})", oa, ob);
        }
    }
    out("\n");

    // For with break preserving index
    fbi : [5]s32 = .[10, 20, 30, 40, 50];
    fbi_idx := 0;
    for fbi: (it, ix) {
        if it == 30 { fbi_idx = ix; break; }
    }
    print("for-break-idx: {}\n", fbi_idx);

    // Multiple print placeholders
    print("multi: {} {} {}\n", 1, 2, 3);
}