In various problem you have to find the number which is present in the string.? so for this we can use istringstream number_iss(the string you input). take a variable of integer example: a and then access the number_iss>>a; You can count the total number in the string,you can easily find out the maximum and minimum of the numbers present in the string. if you don't like my idea that no means you have to give downvoting..