Answer:
a)
for(x=0;x<20;x=x+2)
cout<< x << ' ';
cout<< endl ;
Output
0 2 4 6 8 10 12 14 16 18
In this code we are initialing x with 0, check if it is less than 20, then printing the value 0.
Then we increment x value with 2 and check and print again until the x value tends to be equal or more than 20.
C++ program for verifying
#include <iostream>
using namespace std;
int main()
{
int x;
for( x=0;x<20;x=x+2)
cout<< x << ' ';
cout<< endl ;
return 0;
}
Output
0 2 4 6 8 10 12 14 16 18
(You can check on any ide for confirmation)
b)
i=10;
for (;i>0; i =i/2;)
cout<< i;
This code will produce error expected ‘)’ before ‘;’ token
for(;i>0; i =i/2;)
because for loop consist three parameters and in this loop there are 4 parameters.
If we remove semicolon after i/2,
for(;i>0; i =i/2)
then it will produce an output.
10 5 2 1
C++ program for verifying
#include <iostream>
using namespace std;
int main() {
int i=10;
for(;i>0; i =i/2;)
cout<< i;
return 0;
}
Output
Error-expected ‘)’ before ‘;’ token
for(;i>0; i =i/2;)
