(+ex1)

void main {char s[50],*p,s1[50],s2[50]; int k,sum=0,x; fstream f("date.in",ios::in); fstream g("date.out",ios::out); f>>s; strcpy(s2,s);// copie a sirului initial strcat(s,"+"); g<
 * 2) include
 * 3) include
 * 4) include

}