Thread: assignment of pointer...

Hi ,

I am unable to debug what is going with this program of reversing a string.

I had another doubt that is the assignment
*a = *p
valid because when i try to debug the program it gives error at this line in the program below that access violation writing at location whatever address is contained in a.


insert

Code:

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

void xstrrev(char *);

int main(){

	int i;
	static char *s[] = {
		"To err is human...",
		"But to really mess things up...",
		"One needs to know C!!"
	};

	for(i=0;i<3;i++){
		xstrrev(s[i]);
		printf("\n\r%s", s[i]);
	}
	return 0;
}


void xstrrev(char *a){

	int len,j;
	char *p, temp1, temp2;

	//printf("\n\r%c %d", *a,a);
	len = strlen(a);
	//printf("\n\r%d %d", len, len/2);
	p = a + len -1;
	//printf("\n\r%d %c", p, *p);
	for(j = 1;j<= len/2;j++){
	
		temp1 = *a;
		temp2 = *p;
		printf("\n\r %c %c",*p, *a);
		*a = *p;
		printf("\n\r1\t%c\t%c",*a,*p);
                // *p = temp;
		//printf("\n\r2\t%c\t%c", *p, temp);
                ++a;
		printf("\n\r3");
                --p;
		printf("\n\r4");
        }
}