[英]How would I loop through my array (buffer — contains a text file) , and print it out in chunks of 30 bytes?
[英]How would I get my DFA to loop
我正在編寫一個程序,以檢查用戶輸入的字符串是否為有效的文字。
我的問題是我將如何循環考慮數字(即0,...,9)。 用戶可以輸入任意數量的數字或根本不輸入數字。
到目前為止,我一直在研究案例1:
case 0: if(str[i] == '+' || '-'){ // if first char in the array = (null, +, -)
s=1; // pass test case -> move to next test case
i++; // move to next char in the string
}
else if (str[i] != '+' || '-'){goto a1;} // this case is the null test case -> moves to next test case; string still not a failure
else // fail test case -> the string is automatically a failure
done=true; break;
case 1: a1: if(str[i] >= '0' && str[i] <= '9'){ // if next char in the array = (null, 0, ..., 9)
//HERE: how to make a loop check for however many numbers user has input.
s=2;
i++;
}
else if (str[i] != (str[i] >= '0' && str[i] <= '9')){goto a2;}
else
done=true; break;
我正在考慮使用一個簡單的for循環。
哇, goto
S,已經有一段時間。
Anwyay,您可以執行以下操作:
std::all_of(str.cbegin(), str.cend(), [](char c){return std::isdigit(c);});
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