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结构化程序goto语句_C ++ goto语句| 查找输出程序| 套装1

發布時間：2025/3/11 编程问答 24 豆豆

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結構化程序goto語句

Program 1:

程序1：

#include <iostream> #include <math.h> using namespace std;int main() {int num1 = 1;int num2 = 0;MY_LABEL:num2 = num1 * num1;cout << num2 << " ";num1 = num1 + pow(2, 0);if (num1 <= 5)goto MY_LABEL;return 0; }

Output:

輸出：

1 4 9 16 25

Explanation:

說明：

The above code will print "1 4 9 16 25" on the console screen.

上面的代碼將在控制臺屏幕上顯示“ 1 4 9 16 25” 。

Understand the program step by step.

逐步了解程序。

Here we initialize the variables num1 and num2 by 1, 0 respectively.? And we created a label MY_LABEL.

在這里，我們分別將變量num1和num2初始化為1、0。然后我們創建了標簽MY_LABEL 。

Now evaluate statements iteration wise:

現在，明智地評估語句迭代：

First iteration:

第一次迭代：

num1=1, num2=0 num2 = num1 * num1; Then num1 = 1 and num2 = 1 and then print num2 that is 1. As we know that if we calculate the zero power of any number that will be 1. num1 = num1 + pow(2,0); Then the above statement will increase the value of num1 by one. Then num1 become 2. And num1 is less than equal to 5 then "goto" statement will transfer the program control to the MY_LABEL.

Second iteration:

第二次迭代：

num1=2, num2=0 num2 = num1 * num1; After execution of above statement, num1=2 and num2=4 and then print num2 that is 4 num1 = num1 + pow(2,0); Then above statement will increase the value of num1 by one. Then num1 become 3. And num1 is less then equal to 5 then "goto” statement will transfer the program control to the MY_LABEL.

Third Generation:

第三代：

num1=3, num2=0 num2 = num1 * num1; After execution of above statement, num1=3 and num2=9 and then print num2 that is 9 num1 = num1 + pow(2,0); Then above statement will increase the value of num1 by one. Then num1 become 4. And num1 is less then equal to 5 then "goto" statement will transfer the program control to the MY_LABEL.

Fourth iteration:

第四次迭代：

num1=3, num2=0 num2 = num1 * num1; After execution of above statement, num1=4 and num2=16 and then print num2 that is 16 num1 = num1 + pow(2,0); Then above statement will increase the value of num1 by one. Then num1 become 5. And num1 is less then equal to 5 then "goto" statement will transfer the program control to the MY_LABEL.

Fifth iteration:

第五次迭代：

num1=3, num2=0 num2 = num1 * num1; After execution of above statement, num1=5 and num2=25 and then print num2 that is 25 num1 = num1 + pow(2,0); Then above statement will increase the value of num1 by one. Then num1 become 6. Then condition get false and program get terminated.

Program 2:

程式2：

#include <iostream> #include <math.h> using namespace std;int main() {int num1 = 1;int num2 = 0;int num3 = 1;MY_LABEL:num3 = num3 + num2;cout << num3 << " ";num2 = num2 + 1;num1 = num1 + 1;if (num1 <= 4)goto MY_LABEL;return 0; }

Output:

輸出：

1 2 4 7

Explanation:

說明：

The above code will print "1 2 4 7" on the console screen.

上面的代碼將在控制臺屏幕上顯示“ 1 2 4 7” 。

Understand the program step by step.

逐步了解程序。

Here we initialize the variables num1, num2, and num3 by 1, 0, and 1 respectively.? And we created a label MY_LABEL.

在這里，我們分別將變量num1 ， num2和num3分別初始化為1、0和1。然后我們創建了標簽MY_LABEL 。

Now evaluate statements iteration wise:

現在，明智地評估語句迭代：

First iteration:

第一次迭代：

Here initial values of num1=1, num2 =0, and num3 =1 after executing all statements "1" will be printed on console screen and modified value will be:num1 = 2, num2 = 1, num3= 1;If the condition is true then program control will be transferred to MY_LABEL.

Second iteration:

第二次迭代：

Here values of num1=2, num2 =1, and num3 =1 after executing all statements "2" will be printed on console screen and modified value will be: num1 = 3, num2 = 2, num3= 2;If the condition is true then program control will be transferred to MY_LABEL.

Third iteration:

第三次迭代：

Here values of num1=3, num2 =2, and num3 =2 after executing all statements "4" will be printed on console screen and modified value will be: num1 = 4, num2 = 3, num3= 4;If the condition is true then program control will be transferred to MY_LABEL.

Fourth iteration:

第四次迭代：

Here values of num1=4, num2 =3, and num3 =4 after executing all statements "7” will be printed on console screen and modified value will be: num1 = 4, num2 = 4, num3= 7;Now the if condition gets false and the program will terminate.

總結

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