#include <stdio.h> #include <stdlib.h> /* Puzzle A08 -- add up even, odd and all integers from 0 to N */ int main(int argc, char *argv[]) { int j; int sumAll = 0, sumOdd = 0, sumEven = 0; int n; printf("Enter n: "); scanf("%d", &n ); for (j=0; j<=n; j++ ) { sumAll += j; if ( j%2 == 0 ) sumEven += j; else sumOdd += j; } printf("Sum = %4d, Sum of Odd = %4d, Sum of Even = %4d\n", sumAll, sumOdd, sumEven); system("PAUSE"); return 0; }
Comment: The above is a sensible answer. Here is another way to get the same result:
for (j=0; j<=n; j++ ) { sumAll += j; if ( j%2 == 0 ) sumEven += j; } printf("Sum = %4d, Sum of Odd = %4d, Sum of Even = %4d\n", sumAll, sumAll-sumEven, sumEven);