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

int main () {
        char string[]="1234";
        int size=strlen(string);
        int i;

        printf("size of %s is %d\n",string,size);
        for (i=0; i<size; i++) {
                printf("string[%d] is %c\t",i,string[i]);
                string[size]=string[i];
                printf("string[%d] is %c\t",size,string[size]);
                string[i]=string[size-i];
                printf("string[%d] is %c\t",i,string[i]);
                string[size-i]=string[size];
                printf("string[%d] is %c\n",size-i,string[size-i]);
        }
        string[size]=0;
        printf("size of %s is %d\n",string,size);
}