Help plecase!

Question

Does anyone know how to do this? "Develops a program in the C + language that performs the next task. The program reads a natural 3-digit rummage [100, 999 and determines if the number contains repeating digits. the message that all digits are different Example In the number 757 the digit 7 is repeated 2 times and the number 589 has all the different digits

Answer 1

Make the number a string.
Pick the first character from the string of numbers.
Check if the character is repeted in the string. ...................... complete the algorithm

Answer 2

You can just save that numer as string, and use [] operator to take one of these digits and compare with other