Sample Program 2
Problem statement: Calculate the sum of even numbers for a given upper limit of integers. Solution: We analyze the problem and know that while statement will be used. We need to sum even numbers only. How can we decide that a number is even or not? We know that the number that is divisible by 2 is an even number. How can we do this in C language? We can say that if a number is divisible by 2, it means its remainder is zero, when divided by 2. To get a remainder we can use C’s modulus operator i.e. %. We can say that for a number if the expression (number % 2) results in zero, the number is even. Putting this in a conditional statement: If ( ( number % 2) == 0 ) The above conditional statement becomes true, when the number is even and false when the number is odd (A number is either even or odd).
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