解：源程序如下：main(){ int i,j,x,a[10]; for (i=0;i<10;i++) scanf("%d",&a[i]); printf("enter x:\n"); scanf("%d",&x); for (i=0;i<10;i++) if (x==a[i]) j=i;printf("%d is di %d guo shu!\n",x,j);}
