(单选题)12: 有以下程序:#include<stdio.h>main(){int x,y; printf("Enter an integer(x):");scanf("%d",&x);if(x++<0) y=-1;else if(x==0) y=0;else y=1; printf("%d",y);}现从键盘上输入-1,则程序的输出是( )
A: 0
B: -1
C: 1
D: 不确定的值
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