CPP

get sum in range

# From user input, using lambda
# pass string directly to lambda
print((lambda s: sum(range(int(s[0]), int(s[1])+1)))(input().split()))
# or, convert string to list then pass into lambda
print((lambda s: sum(range(s[0], s[1]+1)))(list(map(int, input().split()))))
# input: 1 100
# output: 5050
# Or, simply, from variables
a, b = 1, 100
print(sum(range(a, b+1)))

get range sum

// get sum from x to y
// initialization of variables
int x = 1, y = 100, sum = 0;
// loop from x to y and add up the current index i
for(int i = x; i = y; i++) sum += i;
std::cout << sum;