#include <stdio.h>
int addnum(int n);

 int main()
{
    int num;
    
    printf("Enter a positive integer: ");
    scanf("%d", &num);
    
    printf("Sum = %d\n\n\n",addnum(num));
    return 0;
}

 int addnum(int n)
{
    if(n != 0)
        return n + addnum(n-1);
    else
        return n;
}

 OUTPUT:

 Enter a positive number: 20
Sum=210


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