c++ sum up numbers
// Method 1: Mathematical -> Sum up numbers from 1 to n
int sum(int n){
return (n * (n+1)) / 2;
}
// Method 2: Using a for-loop -> Sum up numbers from 1 to n
int sum(int n){
int tempSum = 0;
for (int i = n; i > 0; i--){
tempSum += i;
}
return tempSum;
}
// Method 3: Using recursion -> Sum up numbers from 1 to n
int sum(int n){
return n > 0 ? n + sum(n-1) : 0;
}add two numbers in c++
#include <iostream>
using namespace std;
//function declaration
int addition(int a,int b);
int main()
{
int a,b; //to store numbers
int add; //to store addition
//read numbers
cout<<"Enter first number: ";
cin>>a;
cout<<"Enter second number: ";
cin>>b;
//call function
add=addition(a,b);
//print addition
cout<<"Addition is: "<<add<<endl;
return 0;
}
//function definition
int addition(int a,int b)
{
return (a+b);
}how to add numbers in for loop c++
#include <iostream>
int main() {
int n = 0;
int sum = 0;
std::cout << "Please enter and integer: ";
std::cin >> n;
//this will ensure that the integer is posetive.
while (n < 0 ) {
std::cout <<"Please enter positive integer only.n";
std::cout << "Please enter and integer: ";
std::cin >> n;
}
for (int i = 0; i < n ; i++) {
std::cout << i << "n";
sum +=i
}
std::cout << "Sum of odd numbers is " << sum <<".n";
}Copyright © 2021 Codeinu
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