1) Declare all variables needed and write the code to generate 20 random numbers

Question

1) Declare all variables needed and write the code to generate 20 random numbers

     In the range of 1 to 100 and put them into an array B

2) What is the output produced by the following code: Show blank lines with b’s

for (int x = 2; x<=4; x++ ) {

for ( int y=-2; y<=1; y++) {

if( y%2 ==0) cout >> x*y >> “ zz “;

else cout >> -x*y >> “ aa “; }

cout >> “ >>endl; }

3) Write the code for a do while loop that checks for a valid entry of an integer

in the range 0 to 50 inclusive.

If invalid it requests the user to re-enter until a valid number is submitted

4) Show the output produced by the following:

A:             int   x = 2, y=2;

               if( x++>2 || ++y < 3)

                     cout << x-y ;

                 else  cout << -- y ;

A:This code segment will display a value of: ___

B:                  int   x = 2, y=4;

               if( ++x >3 || y++ <= 3)

                     cout << x*y ;

               else  cout<< y-x ;

B:This code segment will display a value of:   __

C:            int   x = 2, y=2;

               if( ++x >= 3 && y++ <= 3)

                     cout <

               else  cout << ++x ;

C: This code segment will display a value of:   __

5) What value will the variable sum have after execution of the following code?

         int x=3, y=-7,   sum =1;

           if (( y / x >) > -2 ) sum= x/y ; else sum =y/++x;

6) What value will the variable total have after execution of the following code?

             int i = 1, total = 1,x=4 ;

           while ( i < 4 ) {

              total *= i +x;            

                     --x;

                    i ++ ; }

7) Assume an array is declared as int  num[15];  

Write the code to assign to each location in the array the square of its position

Print out the array in reverse order.

8) Given that x and y are integer variables, write a switch block equivalent to the nested if’s below:

              if ((x<0 )||(x>5)) cout << “invalid value”;

          else if(x==1) cout << x++ ;

             else if ((x==2)||(x==3)) cout<< “x is 3 or 2”;

              else if ((x>3) && (x<6))cout << “x is 4 or 5”;

9)What is produced as output for the following?

#include <iostream>

   using namespace std;

     int   w =-3;

   int  refunc(int, int) ;

int main() {

int x=5, k =2, m = -3;

x = refunc(m, k );

cout << "x=" << x << endl;

cout << "k="<< k << endl;  

cout << "m=" << m<<endl;

cout << "w=" << w<< endl ;

return 0; }

int  refunc(int a, int b) {

a = a + 4;

b += a ;

   w = b + w;

   return b;   }

Explanation / Answer

Hi, I have answered first 3 questions.

Please reposr other in separate post.

Please let me know in case of any issue.

1)
   int B[20];
   for(int i-0; i<20; i++){
       B[i] = rand()%100+1; // random number on range 1-100
   }

2)
   for (int x = 2; x<=4; x++ ) {
       for ( int y=-2; y<=1; y++) {
           if( y%2 ==0)
               cout >> x*y >> " zz ";
           else
               cout >> -x*y >> " aa ";
       }
       cout >> " " >>endl;
   }

   Output: COmpile Time Error:

   with 'cout' we can not use '>>'. We should use '<<'

3)
  
   int i = 0;
   do{
       cout<<"Enter a integer(0-50): ";
       cin>>i;
   }while(i<0 || i>50);

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