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C++ program to find sum of series 1 + 2 + 3 +……+ n

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#include<iostream.h>
#include<conio.h>

void main()
{
 clrscr();
 int i,n,sum=0;
 cout<<“nEnter the value of n:”;
 cin>>n; 
 for(i=1;i<=n;++i) 
 sum+=i; 
 cout<<“nSum=”<<sum; 
 getch();
}

Output

Enter the value of n: 10
sum=55

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