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//sample snippet
//Note: charAt() is used in java to point to some specific index of string
 
int k=0;
for(i=0;i<row;i++)
{
    if(i%2==0)        // for the first case when we move from left to right
    {
    for(j=0;j<n;j++)
    {
     ch[i][j]=s.charAt(k); //take a character 2-D array
     k++;                  //keep on putting values from 0th position till it goes on
    }
    }
    else                  //this part for right to left movement
    {
        for(j=n-1;j>=0;j--)
        {
            ch[i][j]=s.charAt(k);   //as above
            k++;
        }
    }
}

Main.java:4: error: class, interface, or enum expected
int k=0;
^
Main.java:5: error: class, interface, or enum expected
for(i=0;i<row;i++)
^
Main.java:5: error: class, interface, or enum expected
for(i=0;i<row;i++)
        ^
Main.java:5: error: class, interface, or enum expected
for(i=0;i<row;i++)
              ^
Main.java:9: error: class, interface, or enum expected
    for(j=0;j<n;j++)
            ^
Main.java:9: error: class, interface, or enum expected
    for(j=0;j<n;j++)
                ^
Main.java:12: error: class, interface, or enum expected
     k++;                  //keep on putting values from 0th position till it goes on
     ^
Main.java:13: error: class, interface, or enum expected
    }
    ^
Main.java:17: error: class, interface, or enum expected
        for(j=n-1;j>=0;j--)
                  ^
Main.java:17: error: class, interface, or enum expected
        for(j=n-1;j>=0;j--)
                       ^
Main.java:20: error: class, interface, or enum expected
            k++;
            ^
Main.java:21: error: class, interface, or enum expected
        }
        ^
12 errors

Standard output is empty