I have error in cpp in finding string length

Question

1.00/5 (7 votes)

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C++

//finding string length using pointer and dynamic memory allocation.

// string Length
#include iostream.h
#include conio.h
#include string.h

void main()
{
int *size;
int a,n;

cout<<"Enter the memory size what ever you want: "<>a;
size = new int[a];
if(size == 0)
cout<<"Memory is not allocate: "<>str;
int count=0;
//for( str=0; *str!=0; str++)
//while(*str)
for(int i=0; str[i]!=NULL; i++)
{
count = count+1;
//str++;
}
cout<<"string Length: "

Posted 3-Oct-11 21:18pm

kschandru

Updated 3-Oct-11 21:20pm

André Kraak

v2

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Comments

Legor 4-Oct-11 4:35am

Any question ?

4 solutions

Solution 1

Finding string length

C++

cout << "The size of str is " << str.size() << " characters.\n"

http://www.cplusplus.com/reference/string/string/size/[^]

Posted 3-Oct-11 21:28pm

Prerak Patel

Comments

ThatsAlok 4-Oct-11 6:11am

this is possible only if you using string class!

Prerak Patel 4-Oct-11 6:56am

There is no declaration shown in code so I guessed the same.

Albert Holguin 4-Oct-11 9:26am

true... +5... :)

Solution 3

C-like strings are NULL terminated, hence, you can measure the length of the string counting characters until you find the NULL terminator. Since (in the best hypothesis: as SA pointed out, your program didn't even compile) you allocated memory for the string but didn't initialize it, the allocated memory contains garbage and so you are measuring the length of a 'garbage-string'.

Posted 3-Oct-11 21:53pm

CPallini

Comments

Sergey Alexandrovich Kryukov 4-Oct-11 11:09am

Unfortunately, there is no allocation of str; this variable is not even declared . Allocated is int *size -- take a look.
--SA

Solution 4

I suggest you first learn to write syntactically correct C++ code before asking questions about semantics.

Oh, and FYI - the output you're getting is from the compiler, complaining about your bad syntax, not from your program! This is not VB or any other interpreted language, you first have to get it syntactically right before you can try to run it. See http://www.differencebetween.com/difference-between-compiler-and-vs-interpreter/[^]

Posted 4-Oct-11 22:03pm

Stefan_Lang

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-10-03T21:33:00

How could it possibly compile? There are a number of problems: non-existing operators <> (must be <<, >>), absence of any string (you probably mean char *str? where is that? undeclared variable is used), incomplete last statement of main, no variable in last line and no ';' terminator, no closing bracket in the main block… Why do you have the array int *size and how come it is called size?..

Also, you could use strlen.

Nothing to talk about. I cannot even understand how such text could be written. If you tried to copy some code without understanding, you're just wasting your time.

—SA

I have error in cpp in finding string length

4 solutions

Solution 1

Solution 2

Solution 3

Solution 4

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