如何在C中找到字符串中字符的索引？ [英] How do I find the index of a character within a string in C?

问题描述

假设我有一个字符串qwerty，我希望找到 e 字符的索引位置它。 （在这种情况下，索引将是 2 ）

Suppose I have a string "qwerty" and I wish to find the index position of the e character in it. (In this case the index would be 2)

如何在C中执行此操作？

How do I do it in C?

我找到了 strchr 函数，但它返回一个指向字符而不是索引的指针。

I found the strchr function but it returns a pointer to a character and not the index.

推荐答案

只需从strchr返回的内容中减去字符串地址：

Just subtract the string address from what strchr returns:

char *string = "qwerty";
char *e;
int index;

e = strchr(string, 'e');
index = (int)(e - string);

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