SELF Exam Programming

What the below statement will print if a=10
printf("%d %d",a, !a++);

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SELF Other Question

What value of c will get printed
main()
{
int a,b,c;
a=10;
b=20;
c=printf("%d",a)+ ++b;
printf("n%d",c);
}
What will be the output
main()
{
int i;
i = 10;
if(i == 20 || 30)
{
printf("True");
}
else
{
printf("False");
}
}