如何读取以回车结束字符串

前提：单空格分割

char str[100][20] = { 0 };
    int i = 0;int j=0;
    int count = 0;
    char c='0';
    while (c!='\n') { 
        cin >> str[i];
        count = 0;
        c = getchar();
        i++;
}