[Solved] Comparison inside while loop c++

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Use == not =

if (num == 1) {
    system("start C:\\test\\vw");
    Sleep(2000);
}
else if (num == 2) {
    system("start C:\\test\\vw2");
    Sleep(2300);
}
else if (num == 3) {
    system("start C:\\test\\vw3");
    Sleep(1800);
}

== is for comparison, = is for assignment

The reason why it always chooses the first option is because C++ (and C) has the notion of truthy values. So any value that is not 0 is considered truthy, whereas values that evaluate to 0 are considered falsy.

In your original code, when you assign num to 1, the value of num is truthy, therefore that branch is always taken

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solved Comparison inside while loop c++