char x[ ]="abcdefg";

char y[ ]={'a','b','c','d','e','f','g'};

则正确的叙述为 ___C_____.

int i;

int x[4][4]={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16};

则下面语句的输出结果是___C_____.

for(i=0;i<4;i++) printf("%3d",x[i][3-i]);

#include <stdio.h>

void main( )

{ char  str[ ]="1a2b3c";  int  i;

  for(i=0;str[i]!='\0';i++)

    if(str[i]>='0'&&str[i]<='9')  printf("%c",str[i]);

  printf("\n");

}

#include  <stdio.h>

void main( )

{ int a[ ]={5,4,3,2,1},i,j;

  long s=0;

  for(i=0;i<5;i++)    s=s*10+a[i];

  printf("s=%ld\n",s);

}