why the code is showing error in initialisation of j?

Question

public static void main (String args[])

{

int td[][]= new int [10][10];

int i,j, k=0;

for (i = 0; i<10;i++)

for (j=0; j<10; j++)

{td[i][j]=k;

k++;

}

if (i== j)

{

for(i=0; i<10; i++)

{for(j=0; j<10; j++)

{System.out.print(td[i][j] + " ");

}System.out.println( );

}

}

else if (i != j);

System.out.println();

}

Answer 1

Because i and j and are local variables, which means they don't get assigned default values. You have to initialize them to something or in your for loops put int i = 0/ int j = 0.

Answer 2

int i=0,j=0, k=0;

Answer 3

yeah i was just about to say that.

Answer 4

main method should be in class too

public class Test{

public static void main (String args[])

{

int td[][]= new int [10][10];

int i=0,j=0, k=0;

for (i = 0; i<10;i++)

for (j=0; j<10; j++)

{td[i][j]=k;

k++;

}

if (i== j)

{

for(i=0; i<10; i++)

{for(j=0; j<10; j++)

{System.out.print(td[i][j] + " ");

}System.out.println( );

}

}

else if (i != j)

System.out.println();

}}