C language - looping through scanf.

question:

Continuously input the three sides of the triangle, determine what triangle it is, and output the corresponding statement.

Idea:

1. The triangle here must have three sides, input three numbers, and if you want to keep inputting, you can use while(scanf("%d %d %d",&a,&b,&c)); to achieve this.
2. The scanf() input function returns the valid number of format characters that you want to match. If I enter three numbers and press Enter, then I enter a loop and the scanf() function will read the characters in the corresponding format until it encounters a blank character and stops reading, such as pressing Enter.
3. When scanf("%d",&a), when the a I input is a non-digit, it immediately stops reading and returns 0 (because non-digits are not valid data).
4. Then start doing the questions.
5. Let’s start with the big categories, triangles and not triangles, use if to implement it.
6. Then in the case of triangles, to determine which triangle it is, start with the simplest equilateral one, otherwise it is isosceles, otherwise it is other.

code show as below:

#include <stdio.h>
int main()
{
	
    //输入三个数
    int a,b,c;
    printf("输入三个数字，表示三角形的边，输入非数字，结束循环\n"); 
    while(scanf("%d %d %d",&a,&b,&c)==3)//每次输入的时候判断，当输入的有效数量（为%d格式的，必须输入数字）等于3时ÿ