forCwiczenia

#include<iostream>
#include<cstdio>
using namespace std;
int a,b,c=1;
void menu(){
cout<<"1. Podaj wartosc A.\n";
cout<<"2. Podaj wartosc B.\n";
cout<<"3. Podaj wartosc C.\n";
cout<<"4. For nr1\n";
cout<<"5. For nr2\n";
cout<<"6. For nr3\n";
cout<<"7. For nr4\n";
cout<<"8. For nr5\n";
cout<<"9. Exit\n";
}
void warA(){
cout<<"Podaj wartosc A:";cin>>a;
getchar();getchar();
}
void warB(){
cout<<"Podaj wartosc B:";cin>>b;
getchar();getchar();
}
void warC(){
cout<<"Podaj wartosc C:";cin>>c;
getchar();getchar();
}
void for1(){
cout<<"Liczby z przedzialu "<<a<<" do "<<b<<": ";
for(int i=a;i<=b;i++){
        if(i%2==0) cout<<i<<" ";
}
getchar();getchar();
}
void for2(){
cout<<"Liczby z przedzialu "<<a<<" do "<<b<<" podzielne przez "<<c<<": ";
for(int i=a;i<=b;i++){
        if(i%c==0) cout<<i<<" ";
}
getchar();getchar();
}
void for3(){
for(int i=a;i<b+1;++i){
        for(int j=a;j<b+1;++j){
                cout<<i*j<<" ";if(i*j<10) cout<<" ";
                }
                cout<<"\n";
}
getchar();getchar();
}
void for4(){
int aZap=0,bZap=0;
aZap=1;bZap=b;
for(int i=0;i<bZap;i++){
      aZap*=a;
      }
cout<<a<<" do potegi "<<b<<" to: "<<aZap;
getchar();getchar();
}
void for5(){
int zapA,zapB;
zapA=a;zapB=b;
if (zapA==zapB){cout<<"NWD to "<<a;}else{
for(;zapA==zapB;){
      if(zapA<zapB) {zapB=zapB-zapA;}else{ zapA=zapA-zapB;}
}
cout<<"NWD to "<<zapA;
}
getchar();getchar();
}
int main(){
int wyb=0;
do{
system("cls");
menu();
cout<<"Wybor: ";cin>>wyb;
switch(wyb){
case 1: warA();break;
case 2: warB();break;
case 3: warC();break;
case 4: for1();break;
case 5: for2();break;
case 6: for3();break;
case 7: for4();break;
case 8: for5();break;
case 9: break;
}
}while(wyb!=9);

}