character in string

[canine]

is there a function that determins the position of a certain character in a character array?

[Fordy]

Originally posted by canine
is there a function that determins the position of a certain character in a character array?

I seem to remember strchr()....

 
char str[] = "Hello World";
char *ptrChar = strchr(str,'o');
printf("%s",ptrChar);

This gives a pointer to the first 'o' in the phrase

[canine]

i need to know the actual position though

.................................................. .
char str[]="abcdefg";
int pos;
pos = ?????(str,'e');



<pos = 4>

[QuestionC]

Okay, so you have a pointer to the first occourance of the element in the string...
And you have a pointer to beginning of the string...
And you want the distance to that element from the beginning of the string?
Subtract.

[Fordy]

Originally posted by canine
i need to know the actual position though

.................................................. .
char str[]="abcdefg";
int pos;
pos = ?????(str,'e');



<pos = 4>

char str[] = "Hello World";
int x,pos = 0;
for(x = 0; x < strlen(str);x++){
if(str[x] == 'o'){
pos = x;
break;}
}
printf("o was found at position %d",pos);
return 0;

[clu82]

#include <stdio.h> 

char FindChar(char *p, char c, int *i);

int main()
{
	char MyString[31] = "this is my string";
	char ch = 'm';
	int location = 0;

	if (FindChar(MyString, ch, &location))
		printf("found %c at %d", ch, location);
	else
		printf ("character not found");

	return 0;
}

char FindChar(char *p, char c, int *i)
{
       while (*p)
       {
             if (*p == c)
                   break;

             (*i)++;
             p++;
      }
	
      return *p;    // return the NULL if search character not found
}

One restriction with this solution: you can't search for a NULL since that is the character that signals the caller that we didn't find the search character.

[Salem]

> char str[]="abcdefg";
> int pos;
> pos = ?????(str,'e');

Would be

char str[]="abcdefg"; 
int pos; 
char *p = strchr( str, 'e' );
if ( p != NULL ) {
    pos = p - str;
} else {
    pos = -1;  // something not found
}