有没有在C函数会返回一个char的索引字符数组？ [英] Is there a function in c that will return the index of a char in a char array?

问题描述

有没有在C函数会返回一个char的索引字符数组？

例如是这样的：

  char值[] =0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ;
焦炭找到='E';INT指数= findInedexOf（价值观，找到）;
 

解决方案

和strchr 返回指向第一次出现，所以要找到索引，只取随偏移距起始指针。例如：

  char值[] =0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ;
焦炭找到='E';为const char * PTR =和strchr（价值观，找到）;
如果（PTR）{
   INT指数= PTR  - 值;
   // 做一点事
}
 

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

For example something like:

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

int index = findInedexOf( values, find );

解决方案

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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