objective c - Calculate the sum of numbers between 1 and 100 that end in 5 -


i'm trying calculate sum of numbers between 1 , 100, numbers end in 5: 5, 15, 25, , on.

i have no idea how this; know how calculate sum, not how deal "ends in 5" condition.

here's have far 

int sum = 0; (int = 1; <= 100; i++) {     sum = sum +i; } nslog(@"%i", total);

you don't need loops solve this:

int sum1 = 5 * 20 * 21 / 2;   // find sum of multiples of 5 int sum2 = 10 * 10 * 11 / 2;  // find sum of multiples of 10 int sum = sum1 - sum2;        // remove multiples of 10

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