Write a C program to find the sum of first n natural numbers.

#include  
#include
void main()
{
 int i, n, sum = 0;
clrscr();
printf(“Enter an integer number\n”);
scanf (“%d”, &n);
for (i=1; i <= n; i++)
{
 sum = sum + i;
}
printf (“Sum of first %d natural numbers = %d\n”, n, sum);

getch();
}

Write a Visual Basic program in which integer number is entered by the user and its table is printed on form

WAP in which integer number is entered by the user and its table is printed on form.
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Private Sub Command1_Click()
Dim a, i, j, k
a = Val(Text1.Text)
If a > 0 Then
For i = 0 To 9
For j = a To a
k = Str(j) & " * " & Str(i) & " = " & i * j
Print k
Next j
Next i
Else
MsgBox ("Number is less then or equal to zero")
End If
End Sub

Private Sub Command2_Click()
Text1.Text = ""
table.Cls
Text1.SetFocus
End Sub

Private Sub Command3_Click()
End
End Sub

Private Sub Form_Load()

End Sub
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OUTPUT
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