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Problem C: 零起點學演算法82——陣列中查詢數

#include <stdio.h>

int main( int argc, char *argv[]) {      int n,b,i,m,flag=0,a[20];      while ( scanf ( "%d" ,&n)!=EOF){          for (i=0;i<n;i++){             
scanf ( "%d" ,&a[i]);          }          scanf ( "%d" ,&m);          for (i=0;i<n;i++){          if (a[i]==m){
             b=i;              flag=1;              break ;          
}          }          if (flag==1){          printf ( "%d\n" ,b);          }          else {          printf ( "No\n" );          }          flag=0;      }      return 0; }