b. when the user press , the program calculates the average of the four grades by calculating the summation firstly, and then divide the summation by 4
Finally, the results have to be printed in the picture box (picAvg)
c. if the user forget to enter a value of one or more grade , or if the user entered a non-numaric value like “a”, the program must consider these unexpected values as zeros
for example: if the user enter the values
Grad3= “” (nothing: forget to enter a value)
The summation must be 8+9+0 (instead of “”) + 0 (Instead of “AB”) =17
4. if the user press button , the program must erase any value in the four Text Boxes ( txtGrade1 , txtGrade2, txtGrade3, txtGrade4), and the two picture boxes: picSum, and picAvg
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