條件語句if...else
設int n ，打印1+3+5+...+n，當n為奇數，則累加到n，若為偶數，則累加到n-1，變量n的初始值在程序中指定
玖柒LN
2020-05-23
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2020-07-07
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
int cot = 0;
if(num%2==0) {
for(int i=1;i<=num-1;i=i+2) {? //i每次循環加2，直到i等于num-1，停止
cot = cot + i;
}
System.out.println("n為偶數，從1加到n-1之和為:" + cot);
? ? }else {
? ? for(int i=1;i<=num;i=i+2) {
? ? cot = cot +i;
? ? }
? ? System.out.println("n為奇數，從1加到n-1之和為:" + cot);
}
2020-06-18
上面n為偶數時，條件應該為i<=n-1；等于號忘寫了
2020-06-18
public class Test_if_else {
public static void main(String[] args) {
// TODO Auto-generated method stub
//打印1+3+5+...+n，當n為奇數，則累加到n，若為偶數，則累加到n-1，變量n的初始值在程序中指定
Scanner sc = new Scanner(System.in);
System.out.println("請輸入數字：");
int n = sc.nextInt();
int sum=0;
if(n%2==0) {
for(int i=1;i<n-1;) {
sum+=i;
i+=2;
}
System.out.print(sum);
}else {
for(int i=1;i<=n;) {
sum+=i;
i+=2;
}
System.out.println(sum);
}
}
}
2020-05-26
package com.imooc;
public class helloword {
?public static? void main (String[] args) {
int sum = 0;
for (int i = 1;i<=100;i++)
{
if ( i%2 ==0? ?) {
continue;
}
sum = sum + i;
}
System.out.println("100以內基數和為"+sum);
}
}
? ? ?