Question

15.6： Fix the code to print the count from 1 to x (to loop x times)

#include <iostream> // include the header file

using namespace std;

void count(int x){
  
for(int i=1; i<=x; i++){
cout<<x;
}
}

int main(){
  
int x,i;
  
cin >> x;
count(x);
  
return 0;
}

15.7 Fix the nested for loops to print the count from 1 to x twice, e.g. "12....x12.....x"

#include <iostream> // include the header file

using namespace std;

int main(){
  
int x;
cin >>x;
for(int i=1; i<=x; i++)
for(int j=1; j<=x; j++)
cout<<x;
  
return 0;
}

16.4 Fix the code to print the last element of the array

#include <iostream>

using namespace std;

int main(){
  
int array[7]; // an array of size 7
int x=0;
cin >> x;
for(int i = 0 ; i < 7; i++){ // array initialization
array[i] = x;
  
}

20.6 make both pointers point at the same variable then use use one of the pointers to change it

#include <iostream>

using namespace std;
//make both pointers point at the same variable
//then use use one of the pointers to change it

int main(){
int i;
cin >> i;
cout << i << endl;
int * p;
int * q;
  
//get user input for i using one of the pointers
  
cout << *q << endl;
cout << *p << endl;
cout << (p == q) << endl;
}

  
cout << "The last element is: "<<x;
  
return 0;
}
  

Answer 1

#include <iostream> // include the header file

using namespace std;

void count(int x){
  
for(int i=1; i<=x; i++){
cout<<i<<" ";
}
}

int main(){
  
int x,i;
  
cin >> x;
count(x);
  
return 0;
}

========================================

#include <iostream> // include the header file

using namespace std;

int main(){
  
int x;
cin >>x;
for(int i=1; i<=x; i++)
cout<<x;
for(int j=1; j<=x; j++)
cout<<x;
  
return 0;
}

========================================

#include <iostream>

using namespace std;

int main(){
  
int array[7]; // an array of size 7
int x=0;
cin >> x;
for(int i = 0 ; i < 7; i++){ // array initialization
array[i] = x;  
}
cout<<array[6];
return 0;
}

========================================

#include <iostream>

using namespace std;
//make both pointers point at the same variable
//then use use one of the pointers to change it


int main(){
int i;
cin >> i;
cout << i << endl;
int * p;
int * q;
  
p = q;
  
cout << *q << endl;
cout << *p << endl;
cout << (p == q) << endl;
}

  
cout << "The last element is: "<<x;
  
return 0;
}