How to test input is sane

Question

Consider the following simple C program.

//C test

#include

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

   printf(\"Enter two numbers to add\\n\");
   scan         


        

Answer 1

A simple way would be,

int a=0, b=0, c=0;

initialise them to 0

Additionally, the check suggested by Midhun is good to check if there are two inputs.