int a[]={1,2,3,4,5,6,7},i=5,j; for (j=3;j>1;j--) switch (j) { case 1:putchar (c+2); case 2:putchar (int a[]={1,2,3,4,5,6,7},i=5,j; for (j=3;j>1;j--) switch (j) { case 1: case 2:putchar ("%d",a[i++]);braek;case 3 :putchar ("%d",a[--i]);}}答案是55,

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