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example output:


Meter number is: 124123ABC231


"what should i use to define something like that....


TurboC newbie here...

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For a meter id like "124123ABC231" treat it as text rather than a numeric value. That keeps letters, leading zeros, and formatting intact. was on the right track: use a string-type container so the value can be stored, printed and validated without trying to do arithmetic on it.

Choice depends on your toolchain. In plain C you will use a fixed buffer and must explicitly guard its length and the terminating NUL; in C++ a string class handles memory for you and is easier to work with. Note that classic Turbo C/Turbo C++ is old and its standard library support is limited compared with modern compilers, so std::string and newer library conveniences may not work the same there — consider moving to a modern compiler if possible (Turbo C - Wikipedia, std::string reference).

Practical tips: decide a maximum length and enforce it; trim surrounding whitespace; normalize case if you need consistent comparisons; reject or flag any character that is not a letter or digit (use character-class tests such as isalnum for validation) — see isalnum. Avoid deprecated unsafe input functions; prefer input routines that let you limit how many characters are read (gets was removed for safety reasons). These checks make the data predictable and protect against overflows on older compilers.

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Member Avatar for Ancient Dragon

a character array or std::string

Member Avatar for ToiNKieZ

can you give a sample how to do it...?

Member Avatar for Ancient Dragon 
char mnumber[255];
printf("Enter an item number\n");
fgets(mnumber,sizeof(mnumber), stdin);
if( mnumber[strlen(mnumber)-1] == '\n')
   mnumber[strlen(mnumber)-1] = '\0';
printf("Meter number is: %s\n", mnumber);

Or if you want the c++ version

std::string mnumber;
cout << "Enter an item number\n";
getline(cin,mnumber);
cout << "Meter number is: " << mnumber << '\n';
Edited by Ancient Dragon because: n/a
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