C++ 输入一行数字(含负数)存入数组中的案例

#include<iostream>
#include <stdio.h>
using namespace std;
int main()
{ int i=0;
 int a;
 int num_in[40];
 char c;
 cin>>a; //想要存储的数的数目
 while(i<a)
 {
  c=getchar(); //获取输入字符
  if((c>='0'&&c<='9')||c=='-') //输入正整数、负整数
 {
 ungetc(c,stdin);
 cin>> num_in[i++];
 }
 }
  for(int j=0;j<i;j++)
  {
   cout<<"a["<<j<<"]:"<<num_in[j]<<endl;
  }
  return 0;
 }

#include <iostream>
#include <string>
#include <vector>
#include "stdio.h"
using namespace std;
int main ()
{
 string s;
 while(cin>>s){
  vector<int>nums;
  char *str = (char *)s.c_str();//string --> char
  const char *split = ",";
  char *p = strtok (str,split);//逗号分隔依次取出
  int a;
  while(p != NULL) {
   sscanf(p, "%d", &a);//char ---> int
   nums.push_back(a);
   p = strtok(NULL,split);
  }
  //printf
  for (int i=0; i<nums.size(); i++) {
   printf ("%d\n",nums[i]);
  }
 }
 return 0;
}