前二十个偶数和奇数的和

#include <iostream> using namespace std; int main() { int s1=0,i,j,s2=0,n; for(i=1,j=2,n=0;n<20;n++,i=i+2,j=j+2) { s1=s1+i; s2=s2+j; } cout<<s1<<" "<<s2; return 0; }