int Data Types and scanf Statement in C

Program 1

#include<stdio.h>
#include<conio.h>
int main()
{
       int a=10,b=5,c;
      printf("Enter two number");
      scanf("%d%d",&a,&b);
      //scanf("%d",&a);
     // scanf("%d",&b);
      c=a+b;
      printf("\nAddition of %d and %d is %d",a,b,c);
      c=a-b;
      printf("\nSub of %d and %d is %d",a,b,c);
      c=a*b;
      printf("\nMultiplication of %d and %d is %d",a,b,c);
      c=a/b;
      printf("\nDivision of %d and %d is %d",a,b,c);
            return 0;
}

Program 2

#include<stdio.h>
#include<conio.h>
int main()
{
    int a,b;
    printf("Enter two Number");
    scanf("%d%d",&a,&b);
    printf(" Before swaping %d %d ",a,b);
      a=a+b;
      b=a-b;
      a=a-b;
    printf("\n After swaping %d %d ",a,b);  
return 0;
}