三种循环求1到100的和

 

public class Sum {
    public static void main(String[] args) {
        int i =1,sum=0;
      while (i<=100){
          sum+=i;
          i++;
          System.out.println(sum+"while求一百和");
      }
      new Sum().d();
      new Sum().z();
    }
    public void d(){
        int  sun =0;
        for (int i = 0; i <=100 ; i++) {
        sun+=i;
        System.out.println(sun+"for求一百和");
    }
}
public void  z() {
    int k = 1,j = 0;
    do {
        j+=k;
        k++;
        } while (k<=100);
        System.out.println(j+"do-while求一百和");
    }
}