Question

1、编程：求1+2+3+4+...+100=? p60 (用for循环,while循环,do...while循环)求1*2*3*…*10=?

Answer 1

int sum=0; for(int i=1;i<=100;i++) { sum+=i; } System.out.println(sum); int i=1; sum=0; while(i<=100) { sum+=i; i++; } System.out.println(sum); sum=0; i=1; do { sum+=i; i++; } while(i<=100); System.out.println(sum);这是相加，求相乘只要把sum+=i换成sum*=i就可以了不过貌似相乘结果会超出范围 呵呵

Answer 2

以下是用Java做的，1.for循环：int sum = 0;
for (int i = 1; i <= 100; i++) {
sum += i;
}2.while循环：int sum = 0;
int i = 1;
while (i<=100) {
sum += i;
i++;
}3.do...while循环int sum = 0;
int i = 1;
do {
sum += i;
i++;
} while (i<=100);