subtraction of two pointers..

what is the meaning of subtraction of two pointers??

return str-temp

Code:

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#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);
}

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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

Quote:

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what is the meaning of subtraction of two pointers??

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It is a distance between them