如何阻止 C 存储悄悄进入操作的值？

Question

我编写了一个简单的程序，将两个数字相乘。当我将它与 scanf 输入相乘时，它会打印出随机答案......

#include<stdio.h>
int main()
{
    int a, b ,c = a * b;
    printf("Type two no.s to be multiplied, ensuring space between them");
    scanf("%d%d", &a, &b);
    printf("The required  output is = %d\n", c);
    return 0;

}

当我输入 8 和 7 时，我得到 4897 作为我的答案，那么答案一定是 56。

Answer 1

C 不是 Excel。这：

c = a * b

并不意味着c将始终包含 的值a * b。这意味着您要设置为代码中该点当前c的值。a * b

在读取和 的值后，您需要将其移至。ab

int a, b ,c;

printf("Type two no.s to be multiplied, ensuring space between them");
scanf("%d%d", &a, &b);

c = a * b;
printf("The required  output is = %d\n", c);

Answer 2

问题是你的操作顺序不正确......你必须在scanf之后进行乘法：

#include <stdio.h>

int main()
{
    int a, b, c;

    printf("Type two numbers to be multiplied, ensuring space between them: ");
    scanf("%d%d", &a, &b);

    c = a * b;

    printf("The required output is = %d\n", c);

    return 0;
}