尝试在 if-else 语句中运行计算，但它停止了 - C

Question

我在 C 的介绍性代码 class 中，如果输入大于 1 的数字，我将尝试运行此平方和立方计算，但如果我运行它，它就会停止。 我没有收到任何错误，并且我尝试了不同的方法来通过此处的提示来完成这项工作，但是什么也没有发生，而且我不知道有什么问题。

#include <stdio.h>

int main ()
{
    int num, square, cube;
    
    printf("What is your number? ");
    scanf("%d", num);
    
    if (num > 1)
    {
        square = num * num;
        cube = num * num * num;
        
        printf("\nThe square of your number is ");
        printf("%d", &square);
        printf(" and the cube of your number is ");
        printf("%d", cube);
        printf(".");
    }
    
    printf("\nPlease enter a number greater than 1.");
    
    return 0;
}

Answer 1

在scanf中添加&，打印时删除&操作符打印变量的内存位置。 在scanf中我们应该使用&，这样输入就存储在&var获得的内存地址中。打印完正方形和立方体后退出代码或者将下一个printf放到else块中

#include <stdio.h>

int main ()
{
    int num, square, cube;
    
    printf("What is your number? ");
    scanf("%d", &num);
    
    if (num > 1)
    {
        square = num * num;
        cube = num * num * num;
        
        printf("\nThe square of your number is ");
        printf("%d", square);
        printf(" and the cube of your number is ");
        printf("%d", cube);
        printf(".");
        return 0;
    }
    
    printf("\nPlease enter a number greater than 1.");
    
    return 0;
}

Answer 2

#include <stdio.h>

int main ()
{
    int num, square, cube;
    
    printf("What is your number? ");
    scanf("%d", &num);
    
    if (num > 1)
    {
        square = num * num;
        cube = num * num * num;
        
        printf("\nThe square of your number is ");
        printf("%d", square);
        printf(" and the cube of your number is ");
        printf("%d", cube);
        printf(".");
    }
    else
        printf("\nPlease enter a number greater than 1.");
    
    return 0;
}

Answer 3

当您访问不允许的内存位置时，您会遇到一个称为“分段错误”的常见错误。 正如其他人指出的那样，在读取 num 变量时在 scanf 中使用 & 运算符。

"

Answer 4

您不必在 printf 中使用 &

#include <stdio.h>

int main ()
{
    int num, square, cube;
    
    printf("What is your number? ");
    scanf("%d", num);
    
    if (num > 1)
    {
        square = num * num;
        cube = num * num * num;
        
        printf("\nThe square of your number is ");
        printf("%d", square);
        printf(" and the cube of your number is ");
        printf("%d", cube);
        printf(".");
    }
    
    printf("\nPlease enter a number greater than 1.");
    
    return 0;
}