c - 错误消息 "Expression must have integral or unscoped enum type"

Question

代码:

    int a1, b1, c1, a2, b2, c2;

    printf("This is the program to help you solve \n First Degree In Two Variable Equation \n");

    printf("The standard of \n First Degree In Two Variable Equation is follow: "
        " \n a1 * x + b1 * y = c1\n a2 * x + b2 * y = c2  ");

    printf("Please enter a1");
    scanf("%d", &a1);

    printf("Please enter b1");
    scanf("%d", &b1);

    printf("Please enter c1");
    scanf("%d", &c1);

    printf("Please enter a2");
    scanf("%d", &a2);

    printf("Please enter b2");
    scanf("%d", &b2);

    printf("Please enter c2");
    scanf("%d", &c2);
    if (a1 * b2 == a2 * b1)
        printf("Coefficient's VALUE ARE NOT ALLOW please enter again");
    else
    {
        double x = (double)(b2 * c1 - b1 * c2) / (a1 * b2 - a2 * b1);
        double y = (double)(a1 * c2 - a2 * c1) / (a1 * b2 - a2 * b1);
        printf(" x = " + x + "\n y = " + y);
    }
    return 0;
}

尝试将此代码放在您的 Visual Studio 上，您将在代码末尾看到 printf("x = "+ * x * + "\n y = "+ y);您可以看到 x 我使用 * 来阻止显示错误消息 表达式必须具有整数或无范围枚举类型! 我该如何修复它

Answer 1

尝试下面的代码:

int a1, b1, c1, a2, b2, c2;

printf("This is the program to help you solve \n First Degree In Two Variable Equation \n");

printf("The standard of \n First Degree In Two Variable Equation is followed: "
    " \n a1 * x + b1 * y = c1\n a2 * x + b2 * y = c2  ");

printf("Please enter a1");
scanf("%d", &a1);

printf("Please enter b1");
scanf("%d", &b1);

printf("Please enter c1");
scanf("%d", &c1);

printf("Please enter a2");
scanf("%d", &a2);

printf("Please enter b2");
scanf("%d", &b2);

printf("Please enter c2");
scanf("%d", &c2);
if (a1 * b2 == a2 * b1)
    printf("Coefficient's VALUE ARE NOT ALLOW please enter again");
else
{
    double x = (double)(b2 * c1 - b1 * c2) / (a1 * b2 - a2 * b1);
    double y = (double)(a1 * c2 - a2 * c1) / (a1 * b2 - a2 * b1);
    printf(" x = %f\ny = %f\n", x, y);
}
return 0;
}