题目内容

Defined as: int k = 0;, the expression that has different value from the other three expressions is ( )

A. k++
B. k+=1
C. ++k
D. k+1

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Let all variables have been correctly defined. To assign values 10 and 20 to variables a1 and a2, and to assign characters X and Y to variables c1 and c2, use scanf ("%d%c%d%c", &a1, &c1, &a2, &c2); statement. The correct input form shown below is ( ). (Note:□ stands for space character)

A. 10□X□20□Y
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C. 10□X20□Y
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