subtraction of two pointers..

[transgalactic]

what is the meaning of subtraction of two pointers??

return str-temp

#include <stdio.h>
#include <string.h>

int what(char *str, char ch){	
char *temp;
for( temp = str; *str; str++)
if(*str != ch) *temp++ = *str;
	*temp = ‘\0’;	
	return str-temp;
}

void main(){
	char string[ ]= "xbxbabsxdx";

	printf(“result = %d\n”, what(string, ‘x’));
	puts(string);
}

[compavalanche]

First this is a horrible thing to do. But very common c programming (not c++)

In the above code you have temp pointing to a string lets say "foo"

str then points to foo but a couple characters past it lets say temp+2 = "o"

then str-temp = 2

So I think that function is just finding the location of the element.

I didn't compile this and check so I could be wrong, but this is why this style of programming is bad it takes some thought to figure out exactly what is going on.

Hope that helps

[ixSci]

what is the meaning of subtraction of two pointers??

It is a distance between them