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How to calculate the length of string in C language

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Release: 2019-07-06 10:01:36
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How to calculate the length of string in C language

C语言计算字符串长度,可以手动计算也可以使用库函数或者sizeof()操作符。

方法:

自定义函数求长度

使用strlen()函数

使用sizeof()操作符

自定义函数:

How to calculate the length of string in C language

int cont_str(char *s)
{
int i = 0;      
while ( str[i++] != '\0')   ;
return i;
}
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使用string头文件中的strlen()函数:

How to calculate the length of string in C language

strlen(str); //假设str为待求的字符串数组名

使用sizeof()操作符:

How to calculate the length of string in C language

sizeof(str)/sizeof(str[0]); //假设str为待求的字符串数组名

注意:

strlen()函数求出的字符串长度为有效长度,既不包含字符串末尾结束符 ‘\0’;

sizeof()操作符求出的长度包含字符串末尾的结束符 ‘\0’;

当在函数内部使用sizeof()求解由函数的形参传入的字符数组的长度时,得到的结果为指针的长度,既对应变量的字节数,而不是字符串的长度,此处一定要小心。

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