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kketernality/EvenNumberSum_0915.cpp

Last active September 15, 2019 14:22
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EvenNumberSum_0915.cpp
#include <cstdlib>
bool isEven(int n)
{
return n % 2 == 0;
}
// Note the computation order of operator
int computeSumToNumber(int n)
{
return (n * (n + 1)) / 2;
}
int main(int argc, char* argv[])
{
int n = -1;
// Only even number is allowed
while (!isEven(n)) scanf("%d", &n);
printf("%d", computeSumToNumber(n / 2));
return 0;
}
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