What is the output of the following C program?#include #define STR(x) #x #define CAT(a, b) a##b int main() { int xy = 7; printf("%s %d", ST…

What is the output of the following C program?

#include <stdio.h>
#define STR(x) #x
#define CAT(a, b) a##b
int main() {
    int xy = 7;
    printf("%s %d", STR(a+b), CAT(x, y));
    return 0;
}