How to make a program restart infinitely using while loops in C - c

Question

I am a beginner at learning C language, I have an assignment asking me to write a program that determines whether the data inputted by user makes sense as triangle sides or not.
If it is, I have to determine the type of the triangle, and if it is not, an output such as "It is not a triangle" should be written.
I have to use a while loop for this purpose, and not allowed to use do while.
So that's what I've coded. I'm using DevC++ program.
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
int a;
int b;
int c;
printf("Enter the first side:\n");
scanf("%d", &a);
printf("Enter the second side:\n");
scanf("%d", &b);
printf("Enter the third side:\n");
scanf("%d", &c);
while ((a > 0) && (b > 0) && (c > 0))
{
if (((a + b) > c) && ((a + c) > b) && ((b + c) > a))
{
if ((a == b) && (b == c))
{
printf("That is an EQUILATERAL triangle\n");
break;
}
if ((a == b) || (b == c) || (a == c))
{
printf("That is an ISOSCELES triangle\n");
break;
}
else
{
printf("That is a SCALENE triangle\n");
break;
}
}
else
{
printf("That is not a TRIANGLE.\n");
break;
}
return 0;
}
Now the problems I have are; I am asked to make the program restarts (repeats) itself after each time we have the decision if it is a triangle or not, but I don't know how. This "break" statement that I have written does not work and I think it is not necessary am I right? Also there is this error that comes out when I check my code
D:\Homework1.c [Error] expected declaration or statement at end of input
Could you help me please?
Edit1: Simply and specifically, the loop should always be repeated unless the input numbers are not 0 or (-). So users will always be able to re-enter values if they are not 0 or negative ( And actually that's the loop main condition)
Edit2: I corrected missing } and ((b + c) > c) errors so thank you all.

Answer 1

I do not see a closing brace } at the end of your main (i.e. after return 0). This might be a reason for your compilation error.

Answer 2

here you can go for many ways...
1.Use label,goto
2.Go for functions
3.Avoid break;
4.Alter the code
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
int flag=1;//for handling while loop
while (flag)
{
//call a function to input
//call a function to process
//call a function to output
//flag = get input to repeat(1) or finish (0)
}
return 0;
}
Dont use while loop for checking >0 condition. It is of no use.
Here you use if-else, so break condition is not required.
Handle <0 condition also.

Answer 3

Simply create a loop, while in your case with an endless condition to run. Endless at first but give the ability to the user to be able to terminate the loop.
Read your user input at the start of the loop.
Process the input, so decide if its a triangle and give an output to the user
Ask the user if she/he wants to exit or rerun.
#include <stdio.h>
int main()
{
int exit = 0; // surly you want to exit sometimes
int a;
int b;
int c;
while(!exit)
{
// Get your input
printf("Enter the first side:\n");
scanf("%d",&a);
printf("Enter the second side:\n");
scanf("%d",&b);
printf("Enter the third side:\n");
scanf("%d",&c);
// check your input, process data if it is a triangle, give output
// your code here
printf("a:%d b:%d c:%d\n", a, b, c); // test code of mine
// ask if the user wants to rerun
printf("Exit? Yes(1) No(0):\n");
scanf("%d",&exit);
}
return 0;
}

Answer 4

Just use while(1) loop, do your inputs and checks in it and after each result use continue