為什么while循環里i++在System.out.println();前一行和后一行輸出的值不一樣？
public?class?While1?{
????public?static?void?main(String[]?args)?{
????????int?i???=???0;
????????int?sum?=???0;
????????while(i<=100){
????????sum+=i;
????????????System.out.println(i);
????????i++;
????????}
????}
}
這個代碼所得的的值會往后從1開始到101結束
public?class?While1?{
????public?static?void?main(String[]?args)?{
????????int?i???=???0;
????????int?sum?=???0;
????????while(i<=100){
????????sum+=i;
????????i++;
????????????System.out.println(i);
????????}
????}
}
這段代碼輸出的值會從0開始到100結束
2022-03-18
i++執行的順序不一樣，在前面就先執行i++，就是從2開始輸出，i++在后面，先輸出在自加，就是從1開始
2021-05-21
public?class?While1?{ ????public?static?void?main(String[]?args)?{ ????????int?i???=???0; ????????int?sum?=???0; ????????while(i<=100){ ????????sum+=i; ????????????System.out.println(i); ????????i++; ????????} ????} } 這個代碼所得的的值會往后從0開始到100結束是因為你先輸出的是0然后再累加輸出 public?class?While1?{ ????public?static?void?main(String[]?args)?{ ????????int?i???=???0; ????????int?sum?=???0; ????????{ ????????sum+=i; ????????i++; ????????????System.out.println(i); ????????} ????} } 這段代碼輸出的值會從1開始到101結束是因為你是累加后i=1再輸出100次的