为什么该命令一次获得一个值？

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    while (1){
        scanf("%c", &input);
            if((input>='a')&&(input<='z')) {
                count[input-'a']++;
            }
            else if((input>='A')&&(input<='Z')) {
                count[input-'A']++;
            }
            else {
                break;
            }
    }

为什么该命令一次获得一个值？ while（1）代表无限循环吗？

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ad_est
ad_est

break causes the loop to break thus not running again.

Remove it so the while loop will occur again.

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闷油瓶
闷油瓶

break exit a while whatever the condition in the while.

You did not show what you input in the question. However according to the behaviour you observe, it's not a letter or a uppercase letter, thus you end up breaking the while.

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