What input must be provided to the following “ for Loop With Sum” fragment for it to display 20? #include using namespace std; int main() { int n, sum = 0; cout << ("please enter a positive integer") << endl; cin >> n;
Control structures
Control structures are block of statements that analyze the value of variables and determine the flow of execution based on those values. When a program is running, the CPU executes the code line by line. After sometime, the program reaches the point where it has to make a decision on whether it has to go to another part of the code or repeat execution of certain part of the code. These results affect the flow of the program's code and these are called control structures.
Switch Statement
The switch statement is a key feature that is used by the programmers a lot in the world of programming and coding, as well as in information technology in general. The switch statement is a selection control mechanism that allows the variable value to change the order of the individual statements in the software execution via search.
- What input must be provided to the following “ for Loop With Sum” fragment for it to display 20? #include <iostream>
using namespace std;
int main() {
int n, sum = 0;
cout << ("please enter a positive integer") << endl;
cin >> n;
for (int i = 0; i <= n; i=i+2) {
sum += i;
}
cout << sum << endl;
}
C++ Program:
#include <iostream>
using namespace std;
int main() {
int n, sum = 0;
cout << ("please enter a positive integer") << endl;
cin >> n;
for (int i = 0; i <= n; i=i+2) {
sum += i;
}
cout << sum << endl;
}
Explanation of Program:
Step-1) Taking the integer type variable 'n' for positive integer and initializing sum as 0.
Step-2) Taking the positive integer from the user as cin>>n.
Step-3) Then execute the for loop which is from 0 to i<=n and increment it by i +2.
Step-4) In the for loop, the value of sum = sum + I and it will run continuously until the for loop will ends.
Step-5) Then, display the value of sum.
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