题目内容

有以下程序#include void main(){ FILE *fp; int i;char ch[]=”abcd”,t;fp=fopen(“abc.dat”,”wb+”);for(i=0;i<4;i++)fwrite（&ch[i],1,1,fp）;fseek(fp,-2L,2);fread(&t,1,1,fp);fclose(fp);printf(“%c\n”,t);}程序执行后的输出结果是____________________。

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