Răspuns:
#include <iostream>
using namespace std;
int main()
{
int n,c1,c2,nr=0,p=1;
cin>>n;
cin>>c1;
cin>>c2;
if(n==0 && c1==0)
{cout<<c2;
return 0;}
while(n!=0)
{
if(n%10==c1)
nr=nr+c2*p;
else
nr=nr+(n%10)*p;
p*=10;
n/=10;
}
cout<<nr;
return 0;
}
Explicație: