#include<stdio.h> int search(int k,int a[],int length) { int ret=-1; for(int i=0;i<length;i++) { if(a[i]==k) { ret=i; break; } } return ret; } int main() { int a[]={0,1,2,3,4,5,6,7,8,9}; int x; int loc; scanf("%d",&x); loc=search(x,a,sizeof(a)/sizeof(a[0])); if(loc!=-1) { printf("%d在第%d个位置 ",x,loc); } else { printf("不存在! "); } return 0; }