Problem converting from char array to int array.

I'm using the following code to do so:

Code:

---

#include <stdio.h>

int main ()
{
int i;
char ch[20]="1 2 34 4 56672332432";
int ch1[20];
for (i=0; i<20; i++)
{
      ch1[i]=(int)ch[i]-'0';
}
for (i=0; i<20; i++)
{
      printf ("%d\n ", ch1[i]);
}
return 0;
}

---

The problem is I can't an integer more than 9 as it is. For example, the array is reading and converting each char separately, so for example if I want to get 34 form char array into an integer 34, it won't do so. It picks and gives 3 separately and 4 separately.

What should I do for this problem?

Use sscanf instead.

Ok, instead of the following code:

Code:

---

for (i=0; i<20; i++)
{
      ch1[i]=(int)ch[i]-'0';
}

---

I tried the following:

Code:

---

for (i=0; i<20; i++)
{
sscanf("%s", ch1);
}

---

and also:

Code:

---

for (i=0; i<20; i++)
{
ch1[i] = sscanf("%s", ch);
}

---

But neither works. What would be the proper code?

Let's clarify what you are trying to do. Are you trying to convert the string "1 2 34 4 56672332432" into a sequence of 5 integers, 1, 2, 34, 4 and 56672332432?

String would be: ""1 2 34 4 56"

I want to read this as an int array of size 5.

Ah. Okay, one approach is to use a stringstream. The idea is to treat the string as if it were the contents of a file. For example:

Code:

---

#include <iostream>
#include <string>
#include <sstream>

int main()
{
    using namespace std;
    string str = "1 2 34 4 56";

    stringstream ss(str);
    int numbers[5];
    for (int i = 0; i < 5; ++i)
    {
        ss >> numbers[i];
    }

    for (int i = 0; i < 5; ++i)
    {
        cout << numbers[i] << '\n';
    }
}

---

This is C++. I'm doing in C.

Right. This thread has been moved to the C programming forum.

oh sorry, I didn't know I was in C++ forum! :s

Quote:

---

Originally Posted by TheUmer

Ok, instead of the following code:

Code:

---

for (i=0; i<20; i++)
{
      ch1[i]=(int)ch[i]-'0';
}

---

I tried the following:

Code:

---

for (i=0; i<20; i++)
{
sscanf("%s", ch1);
}

---

and also:

Code:

---

for (i=0; i<20; i++)
{
ch1[i] = sscanf("%s", ch);
}

---

But neither works. What would be the proper code?

---

Have you used any scan functions before? Have you even bothered to look up sscanf anywhere at all?

Code:

---

#include <stdio.h>

int main ()
{
    int count = 0;
    int i;
    char ch[20]="1 2 34 4 56";
    int num[20];
    int poz;
    const char* str = ch;
    while(sscanf(str,"%d%n",&num[count], &poz) == 1)
    {
        count++;
        str += poz;
        if(count == 20) break;
    }
    for (i=0; i<count; i++)
    {
        printf ("%d\n", num[i]);
    }
    return 0;
}

---

@vart:

Thanks a lot. That really worked. I'm highly obliged. Now I can carry on with my assignment.