How can i get system information with c in linux?

i want to write a c code to get system information like cpu and memory in linux i don't know how pliz help.

How can i get system information with c in linux?
void sysinfo()


{


char *buf=(char*) malloc(sizeof(char)*255);


FILE* finfo;


int lines=31;


finfo=fopen("/proc/cpuinfo","r");


while(lines%26gt;0)


{


fscanf(finfo,"%s",tempbuf);


printf("%s ",tempbuf);


lines--;


}


fclose(finfo);


printf("\n");


lines=12;


finfo=fopen("/proc/meminfo","r");


while(lines%26gt;0)


{


fscanf(finfo,"%s",tempbuf);


printf("%s ",tempbuf);


if(strcmp(tempbuf,"kB")==0)


printf("\n");


lines--;


}


printf("\n");


fclose(finfo);


free(buf);


}