[英]What does str[i]!='\0' mean?
這是代碼:
for (int i = 0; str[i]!='\0'; ++i)
這是我上網的完整代碼:
#include<iostream>
#include<string.h>
using namespace std;
int main ()
{
char str[50];
int v = 0, c = 0, n = 0, s = 0;
cout << "Enter a string : ";
gets(str);
//The line
for (int i = 0; str[i]!='\0'; ++i)
{
if (str[i] == 'a' || str[i] == 'e' || str[i] == 'i' || str[i] == 'o' || str[i] == 'u' || str[i] == 'A' || str[i] == 'E' || str[i] == 'I' || str[i] == 'O' || str[i] == 'U')
{
++v;
}
else if ((str[i] >= 'a' && str[i] <= 'z') || (str[i] >= 'A' && str[i] <= 'Z'))
{
++c;
}
else if (str[i] >= '0' && str[i] <= '9')
{
++n;
}
else
{
++s;
}
}
cout << "Number of vowels : " << v;
cout << "\nNumber of consonants : " << c;
cout << "\nNumber of numbers :" << n;
cout << "\nNumber of special characters : " << s;
return 0;
}
\0 是零字符。 在 C++ 中用於表示字符串的終止
if (str[i] != '\0')
表示“如果不在字符串末尾”
C 字符串(字符數組)中的最后一個字符是 null ( '\0'
) 值。
str[i]?='\0' 是什么意思?
!=
是不等式運算符。 當操作數相等時它產生假,否則產生真。 str[i]
和'\0'
是此表達式中的操作數。
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