es 3 vacanze

#include
FILE *f1;
FILE *f2;
FILE *f3;
int n;
int i;
void copiaNumeri(){
f1=fopen("file1.txt","r");
f2=fopen("file2.txt","r");
f3=fopen("file3.txt","w");
fscanf(f1,"%d",&n);
while(n!=999){
fprintf(f3,"%d\n",n);
fscanf(f1,"%d\n",&n);
}
fscanf(f2,"%d",&i);
while(i!=999){
fprintf(f3,"%d\n",i);
fscanf(f1,"%d\n",&i);
}
fclose(f1);
fclose(f2);
fclose(f3);
}
int main(){
copiaNumeri();
}