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suma n*(n+1)

by

//1*2+2*3+..+n*(n+1)#include<iostream.h>#include<conio.h> int p(int k){return k*(k+1);} int s(int k){if (k==0) return 0;else return p(k)+s(k-1);} void main(){int n;cout<<“n=”;cin>>n;cout<<s(n)<<endl;getch();} {module orizontal600}

combinari

by

//combinari#include<iostream.h>#include<conio.h> long comb(int n,int k){if (k==0)  return 1;else if (k>n) return 0; else return (comb(n-1,k)+comb(n-1,k-1));} void main(){int k,n;cout<<“n=”;cin>>n;cout<<“k=”;cin>>k;cout<<//”combinari de”<<n<<“elemente luate cate”<<k<<“:”<<comb(n,k)<<endl;getch();} {module orizontal600}

suma a n componente

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//sa se calculeze suma componentelor unui vector cu  n elemente#include<iostream.h>#include<conio.h>typedef int vector[20];int n;vector v; int suma(vector v,int n){if (n==0) return 0;else return (v[n]+suma(v,n-1));} void main(){int i;cout<<“n=”;cin>>n;for(i=1;i<=n;i++) {cout<<“v[“<<i<<“]=”;cin>>v[i];}cout<<“suma este”<<suma(v,n)<<endl;getch();} {module orizontal600}