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 #include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <malloc.h>
#define f(a,b) a##b
#define g(a)  #a
#define h(a) g(a)
int main()   
{   
    char a = 'a';      
    printf("%s\n",g(a)); // a
    printf("%s\n",g(g(a))); // g(a)
    printf("%s\n", h(f(1,2)));   // 12
    printf("%s\n", g(f(1,2))); // f(1,2)
    printf("%s\n", g(h(f(1,2)))); // h(f(1,2))
    printf("%s\n", h(g(f(1,2)))); // "f(1,2)"
    printf("%s\n", h(h(f(1,2)))); // "12"
    return 0;   
}


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#include <sys/types.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int main(){
int sockfd;
int len;
struct sockaddr_in address;
int result;
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