Computer Science Canada converting string to integer |
| Author: | Fonzie [ Thu Sep 27, 2007 4:59 pm ] |
| Post subject: | converting string to integer |
I need to figure out how to convert a string filled with numbers into an unsigned long long int. The string will have anywhere between 1 and 10 characters. I want it so that the string "9876543210" becomes the integer number 9876543210. for this program I am only allowed to use functions in the string.h library, getchar(), putchar() and printf(). Thanks in advance. |
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| Author: | Tony [ Thu Sep 27, 2007 5:08 pm ] |
| Post subject: | RE:converting string to integer |
Start by figuring out how to get an individual character out of that string (say c = "2") while keeping track of its position from the end (n = 3[rd] char) Converting a character to an integer is easy, think ASCII values. That n will let you know where in the string it was. c = 2 n = 3 c * 10 ** (n-1) = 200 Then just add all of that up. |
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| Author: | Fonzie [ Fri Sep 28, 2007 2:01 pm ] |
| Post subject: | Re: converting string to integer |
that worked, thanks a lot. |
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