Unexpected output of printf

Question

int a=5;
float b=3.5;
printf(\"%d\",b);
printf(\"\\n%f\",a);

Can anyone please tell me why this code is showing unexpected output (garbage\\n3.5)

Answer 1

int main()
{

int a=5;
float b=3.5;
printf("%f",b); //Use %f
printf("\n%d",a); // Use %d

}

Refer: printf

wrong format specifier to printf leads undefined behavior in most cases.

However, since printf is a variadic function, and the arguments to variadic functions undergo the default argument cast. Like, a char is casted to an int.