Răspuns:
1.#include <iostream>
using namespace std;
int main()
{
int k = 0, contor = 0;
cin >> k;
for( int i = 100; i <= 999; ++i )
{
if( i % 10 == k )
++contor;
}
cout << contor;
return 0;
}
2.#include <iostream>
using namespace std;
int main()
{
int a = 0, b = 0, suma = 0;
cin >> a >> b;
for( int i = a; i <= b; ++i )
{
if( i >= 10 && i <= 99 )
{
if( ( i % 10 ) % 2 == 1 )
suma += i;
}
}
cout << suma;
return 0;
}
3.#include <iostream>
using namespace std;
int main()
{
int a = 0, contor = 0;
cin >> a;
for( int i = 10; i <= 99; ++i )
{
if( i % a == 0 )
++contor;
}
cout << contor;
return 0;
}
4.#include <iostream>
using namespace std;
int main()
{
int d = 0;
cin >> d;
for( int i = 1000; i <= 9999; ++i )
{
int copie = i;
if( copie % 10 == d )
{
while( copie > 9 )
{
copie /= 10;
}
if( copie == d )
cout << i << " ";
}
}
return 0;
}
Explicație:
