#includeint main() { int i = 0; double sum = 0.0; int flag = 1; for(i=1;i<=100;i++) { sum += flag*1.0/i; flag = -flag; } printf("%lfn", sum); return 0; }

#includeint main() { int i = 0; double sum = 0.0; int flag = 1; for(i=1;i<=100;i++) { sum += flag*1.0/i; flag = -flag; } printf("%lfn", sum); return 0; }