c中是否有一个函数可以返回char数组中char的索引? [英] Is there a function in c that will return the index of a char in a char array?

问题描述

c 中有一个函数可以返回 char 数组中 char 的索引吗?

Is there a function in c that will return the index of a char in a char array?

例如:

char values[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
char find = 'E';

int index = findIndexOf( values, find );

推荐答案

strchr 返回指向第一次出现的指针，所以要找到索引，只需取起始指针的偏移量即可.例如:

strchr returns the pointer to the first occurrence, so to find the index, just take the offset with the starting pointer. For example:

char values[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
char find = 'E';

const char *ptr = strchr(values, find);
if(ptr) {
   int index = ptr - values;
   // do something
}

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