c - 为什么这个程序在 C 语言中不能运行？

Question

输入P或A后我的程序无法运行，为什么？这是来自udemy类(class)的挑战。我只是编程初学者:)

#include <stdio.h>
#include <stdlib.h>

int main()
{
    float height=0;
    float width=0;
    float area=0;
    float perimeter=0;
    printf("Enter height of rectangle :");
    scanf("%f",&height);
    printf("Enter width of rectangle :");
    scanf("%f", &width);

    char choice;
    printf("Enter P for perimeter and A for area: ");
    scanf(" %c", choice);
    if(choice=='P' || choice=='p'){       
        printf("Width: %f", width);
        printf("Height: %f", height);
        perimeter= 2.0*(height*width);
        printf("Perimeter of rectangle is: %f", perimeter);
    }else if(choice=='A' || choice=='a'){
        printf("Width: %f", width);
        printf("Height: %f", height);
        area= (height*width);
        printf("Area of rectangle is: %f", area);
    }else
        printf("Invalid Input");
}

Answer 1

更正如下:

scanf(" %c", &choice);

&choice 将指向您要存储该值的地址。