5) Numeric addresses for computers on the international network Internet are com

Question

5) Numeric addresses for computers on the international network Internet are composed of four parts, separated by periods, of the form:

xx.yy.zz.mm

where xx, yy, zz, and mm are positive integers. Locally, computers are usually known by a nickname as well. You are designing a program to process a list of Internet addresses, identifying all pairs of computers from the same locality. Create a structure type called address_t with components for the four integers of an Internet address and a fifth component in which to store an associated nickname of 10 characters. Your program should read a list of up to 100 addresses and nicknames terminated by a sentinel address of all zeros and a sentinel nickname.



SAMPLE DATA:
111.22.3.44 platte
555.66.7.88 wabash
111.22.5.66 green
0.0.0.0 none



The program should display a list of messages identifying each pair of computers from the same locality---that is, each pair of computers with matching values in the first two components of the address. In the messages, the computers should be identified by their nicknames.

Explanation / Answer

#include #include #include struct address_t {int xx; int yy; int zz; int mm; char nname[10]; }add[100]; int local_address(struct address_t,struct address_t ); void scan_address(char[],struct address_t[],int); void print_address(struct address_t); int main() {char address[12]; FILE *in; int i=0,j,k; in=fopen("input.txt","r"); if(in == NULL) {printf("Error opening input file! "); return 0; } fscanf(in,"%s",&address); while(strcmp(address,"0.0.0.0")!=0) {fscanf(in,"%s",add[i].nname); scan_address(address,add,i); i++; fscanf(in,"%s",&address); } printf("the addresses are: "); for(j=0;j

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