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【单选题】
下列程序的输出结果是( )。 #include int x1 = 30, x2 = 40; sub(int x, int y) { x1 = x; x = y; y = x1; } int main() { int x3 = 10, x4 = 20; sub(x3, x4); sub(x2, x1); printf("%d,%d,%d,%d", x3, x4, x1, x2); return 0; }A.
10,20,40,40
B.
10,20,30,40
C.
10,20,40,30
D.
20,10,30,40
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A.
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B.
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C.
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A.
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A.
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B.
reiterates a part
C.
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D.
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