TC Compiler behaving unintended

Hello All

There are 2 code snippets

Code:

main()
{
int a=3;
printf("%d \t%d\t %d",a);
}

TC Output 3 3 0
GCC Output 3 0 garbage

Code:

main()
{
long int a=3;
printf("%d \n%d\n %d",a);
}

Output 3 0 3
GCC Output 3 0 garbage

can anyone explain why this unintended behaviour if both the compilers.

 

hain ,
that the internal working of compiler how to treat the %d in scanf.