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Join Date: Nov 2007
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Newbie Poster
Determining Invalid Characters in a String?? I am new to the world of C but am enthusiastic nonetheless, so pardon me if this appears to be a particularly basic question...
I am attempting to write a program that uses DNA strands.. which consist of A,T,C,and G characters...
The user is prompted to input a DNA strand.
After they have input the string of a certain length I want to use a user defined function to check the string and ensure the fact that it doesn't contain any letters that are not A,T,C, or G. If it does contain an invalid character I want to alert the User... If it does not contain any characters other than A,T,C, or G then there will be no problem and the program will continue...
any help regarding this would be greatly appreciated.
David
I am attempting to write a program that uses DNA strands.. which consist of A,T,C,and G characters...
The user is prompted to input a DNA strand.
After they have input the string of a certain length I want to use a user defined function to check the string and ensure the fact that it doesn't contain any letters that are not A,T,C, or G. If it does contain an invalid character I want to alert the User... If it does not contain any characters other than A,T,C, or G then there will be no problem and the program will continue...
any help regarding this would be greatly appreciated.
David
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Join Date: Dec 2005
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Something simple like a for loop to check each character in turn perhaps?
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Join Date: Oct 2007
Location: Cherry Hill, NJ
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Or you could just use the strspn() function:
if (strspn( dnaStr, "AaTtCcGg" ) < strlen( dnaStr )) puts( "error in DNA" ); •
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Originally Posted by Duoas 
Or you could just use the strspn() function:
if (strspn( dnaStr, "AaTtCcGg" ) < strlen( dnaStr )) puts( "error in DNA" );
@BensonRoss, make sure you include <string.h> for strspn() and strlen().
At the very moment that I find myself in the side of the mayority, I will know that I need to re-think my ideas. ~ In my book.
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