It would help to see your code for your implementation of the while loop to see what’s wrong, but the general solution for converting a for loop to a while loop is this:
for(i=1;i<=2;i++)
{
/*your code*/
}
becomes
i = 1;
while(i<=2)
{
/*your code*/
i++;
}
Make sure your iterators and decrementors are in the right places.
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solved want to create diamond shape using while in C