int sum = 0,k=-1;for(int i = 1; i
java编程题使用for循环计算1-2+3-4+...-100
int sum = 0,k=-1;
for(int i = 1; i <=100; i++){
k = -k;
sum = sum + (k*i);
}
System.out.println(sum);2015-04-29
int sum = 1;for(int i = 2; i <=100; i++){ if(i%2!=0){ sum += i; }else{ sum -=i; }}System.out.println(sum);2015-04-29
int i=1,n=100;
int sum =0;
for(;i<=n;i++){
if(i%2==0){
sum-=i;
}else{
sum+=i;
}
}
System.out.println(sum);2015-04-29
