Why can't variables be declared in an if statement?

Question

The following Java code does not compile.

int a = 0;

if(a == 1) {
    int b = 0;
}

if(a == 1) {
    b = 1;
}

Why? There can be no code pa

Answer 1

int a = 0;

if(a == 1) {
int b = 0; // this int b is only visible within this if statement only(Scope)
}

if(a == 1) {
b = 1; // here b can't be identify
}

you have to do following way to make correct the error

    int a = 0;
    int b = 0;
    if(a == 1) {
       b=0;
    }
    if(a == 1) {
        b = 1;
    }