[英]Calculating length of a string in C
int strlength(const char *myStr){
//variable used for str length counter
int strlength = 0;
//loop through string until end is reached. Each iteration adds one to the string length
while (myStr[strlength] != '\0'){
putchar(myStr[strlength]);
strlength++;
}
return strlength;
}
Why will this not work as intended? 为什么这不能按预期工作? I just want to find the length of a string. 我只想找到一个字符串的长度。
From a comment on another answer: 从对另一个答案的评论:
I am using fgets to read in a string. 我正在使用fgets读取字符串。 and i have checked to make sure that the string that was typed was stored correclty 并且我已经检查以确保所键入的字符串正确存储
In that case, there is a trailing newline stored, so your function computes 在这种情况下,将存储尾随换行符,因此您的函数将计算
strlength("hello\n")
The code is correct, you just didn't pass it the input you believed to pass. 该代码是正确的,您只是没有将您认为要传递的输入传递给它。
More reliable version: 更可靠的版本:
size_t strlength(const char * myStr)
{
return strlen(myStr);
}
You can try this also:- 您也可以尝试以下操作:
int string_length(char *s)
{
int c = 0;
while(*(s+c))
c++;
return c;
}
No need to worry about fgets() and removing the trailing \\n
. 无需担心fgets()并删除尾随\\n
。
while (myStr[strlength] != '\0'){
putchar(myStr[strlength]);
strlength++; //When mysStr[strlength] == \0, this line would have already incremented by 1
}
Quick fix: 快速解决:
return (strlength-1);//This will return correct value.
A more better approach: 更好的方法:
int strlen(const char *s)
{
char *str=s;
while(*str)
{
str++;
}
return (s-str);
}
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