Forum posts for alg.exe

Exception during char operation

I'm practising programming and got something and I don't know the reason.

Here is my source with the place of the error:

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

int main()
{
// the max length of one line is given
std::vector<char*> tmp = {'abc', 'abcba', 'abcd'};
for (char *input : tmp)
{
int counter = 0;
int length = strlen(input);
char *start = &input[0];
char *end = &input[length - 1];
while (start < end)
{
while (*start < *end)
{
char s = *end;
s--;
*end = s; /*Unhandled exception at
0x009398EE in alg.exe: 0xC0000005:
Access violation writing location 0x00940D5E.*/
counter;
}
start++;
end--;
}

std::cout << counter << std::endl;
}

return 0;
}


I know I could decrement in one line, but it's in three lines because of debugging.
Why cannot I change the value of (*end) ?
I would thank every idea.

Tamás

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