I am looking for a code which can add without using + sign

i searched the net and found the following code......can anyone explain me
whats happening in this ??

#include<stdio.h>
#include<conio.h>
int main()
{
int a=3000,b=20,sum;
char *p;
p=(char *)a;
sum= (int)&p[b]; //adding a & b
printf("Answer is :");
printf("%d",sum);
return 0;
}

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