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C中指针与整数的比较(Comparison between pointer and integer in C)

 我有一个关于C程序的愚蠢问题。我的编译器说： 警告：指针和整数之间的比较 。 我真的不知道为什么。 我只想在屏幕上写每个字符。  
 我的代码：  
int i = 0;
char str[50] = {'s', 'a', 'm', 'p','l','e'}; //only for test
while (str[i] != NULL) {
    putchar(str[i]);
    i++;
}
 
 你能帮我吗？ 我没有在互联网上找到任何有用的答案。 

I have a bit stupid question about program in C. My compiler says me: warning: comparison between pointer and integer. I really don't know why. I only want to write each char on the screen. 
My code: 
int i = 0;
char str[50] = {'s', 'a', 'm', 'p','l','e'}; //only for test
while (str[i] != NULL) {
    putchar(str[i]);
    i++;
}
 
Can you help me please? I didn't find any usefull answer on the internet.

原文：https://stackoverflow.com/questions/10223095

更新时间：2022-04-18 20:04

最满意答案

 您可以使用GroupBy按月将列表分组。 例如，以下内容将按月分组（月份+年，实际上），然后将每月的所有值写入控制台：  
var grouped = monthlySales.GroupBy(ms => string.Format("{0}-{1}", ms.Month, ms.Year));

foreach(var group in grouped)
{
     Console.WriteLine("Values in month-year of {0}:", group.Key);
     foreach(var ms in group)
         Console.WriteLine("   {0}", ms.USDRevenueTotal);
}

You can use GroupBy to group the list into groups by month. For example, the following will group by Month (month+year, actually) and then write out to the console all values per month: 
var grouped = monthlySales.GroupBy(ms => string.Format("{0}-{1}", ms.Month, ms.Year));

foreach(var group in grouped)
{
     Console.WriteLine("Values in month-year of {0}:", group.Key);
     foreach(var ms in group)
         Console.WriteLine("   {0}", ms.USDRevenueTotal);
}

C中指针与整数的比较(Comparison between pointer and integer in C)

最满意答案

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