Re: [Dev-C++] <Dec-C++>Please give me your feedbacks!
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Re: [Dev-C++] <Dec-C++>Please give me your feedbacks!
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From: Per W. <pw...@ia...> - 2004-11-05 17:06:35
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Schoolwork is ment to reinvent the wheel to teach how a wheel works...
/Per W
On Fri, 5 Nov 2004, Cary Haynie wrote:
> i'd look into this handy little function from string.h if I were you:
>
> size_t strlen(const char* cs)
> returns the length of string cs without counting the terminator
>
> and, stdlib.h has a atoi (array to int) function already, so this is
> kinda reinventing the wheel, as most arch's that have a c compiler
> also have a complementary c library.
>
> also, converting a string to a regular int seems like it would only
> have limited use as you can only assume that an int is 16 bits, making
> the range of possible values this function can return 32767 to -32768
> or 0 65535 if it is an unsigned int. if you need to process arbitrary
> length numbers, there are some good, albeit non-standard libraries
> available for both c and c++
>
>
> good luck though.
> Cary
>
> On Fri, 5 Nov 2004 11:17:54 +0100 (CET), Per Westermark
> <pw...@ia...> wrote:
> > 1) If you have problems with school assignments, why don't you just admit
> > that? An embedded system - where there might not be an existing RTL,
> > forcing the developer to write it's own strtoi doesn't need wide character
> > support...
> >
> > 2) Why do a loop that both uses an index and counts size? Why isn't the
> > size variable enough to locate the last character. Why isn't this loop
> > breaking at the first non-digit?
> >
> > 3) Real strtoi doesn't write any error messages. There might not even be a
> > console for emitting any messages... It should just stop at the
> > first invalid character.
> >
> > 4) Why do nested loops for exponent? A real implementation converts from
> > end of string, just multiplying the previous sum by 10 every time it has
> > one more digit to process.
> >
> > 5) You have missed handling numbers starting with a sign. 6) How do you
> > think you can load a text string with scanf without allocating the memory.
> > You have a pointer but that doesn't point to a text buffer for storing
> > your digit string.
> >
> > /Per W
> >
> >
> >
> > On Fri, 5 Nov 2004, Justin Fan wrote:
> >
> > > Hi,
> > >
> > > I'm newer to C++ programming so I hope you can help me to improve my
> > > coding skill. Here is my first code to implement Strtoi(char*), please
> > > give me your feedback.
> > > My lead ask me to implement it as Strtoi(wchar*), but I can't find
> > > which head contains the definition of wchar and how to use it. And
> > > some known bugs are there after tesing:
> > >
> > > when I input a long string such as "12345678987654321", this app will crash.
> > > Also when I add a sentence before sleep(), it crashed.
> > >
> > > BTW, I want to know how to debug an app and how to track views I added.
> > >
> > > Any ideas?
> > >
> > > Thanks in advance and any suggestions will be appreciated!!
> > >
> > > #include <stdlib.h>
> > >
> > > int strtoi(char* a)
> > > {
> > >
> > > int sum=0,size=0,i=0;
> > >
> > > while(a[i]!='\0') // calculate the size of the array
> > > {i++;size++;}
> > >
> > > printf("The size of string is: %d\n",size);
> > > i=0;
> > >
> > >
> > > for(i=0;i<size;i++)
> > > {
> > > if (a[i]<'0' || a[i]>'9') //Don't deal with invalid strings
> > > { printf( "I think it's meaningless to covert a English word to
> > > int.\n Please input some string such as 123");
> > > return 0;
> > > }
> > > else
> > > {
> > > int j=0; //variable 'j' refers to the exponet of 10
> > > int temp=a[i]-'0'; //covert a[i] to a interger
> > > for(j=size-i-1;j>0;j--) //sum
> > > temp=temp*10;
> > >
> > > sum+=temp;
> > > }
> > > }
> > > printf("The result of convertion:%d\n",sum);
> > > return sum;
> > >
> > > }
> > > int main()
> > > {
> > > int i=0;
> > > char* a;
> > > printf("Please input your string,such as 123\n");
> > > scanf("%s",a);
> > > strtoi(a);
> > > sleep(100000);
> > > return 0;
> > > }
> > >
> > > --
> > > Thanks
> > > Z.J.
> > >
> > >
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>
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