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A value is read before it has been initialized. For example, in C:
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```c
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struct coordinates {
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int x;
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int y;
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};
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void foo() {
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struct coordinates c;
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c.x = 42;
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c.y++; // uninitialized value c.y!
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int z;
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if (z == 0) { // uninitialized value z!
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// something
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}
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}
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```
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