C Program which Converts an Integer to String & vice-versa

Code:

#include  stdio.h>
#include  string.h>
#include  math.h>

void tostring(char [], int);
int toint(char []);

int main()
{
    char str[10];
    int num, result;

    printf("Enter a number: ");
    scanf("%d", &num);
    tostring(str, num);
    printf("Number converted to string: %s\n", str);
    result = toint(str);
    printf("Number converted back to integer: %d\n", result);

    return 0;
}

void tostring(char str[], int num)
{
    int i, rem, len = 0, n;

    n = num;
    while (n != 0)
    {
        len++;
        n /= 10;
    }
    for (i = 0; i < len; i++)
    {
        rem = num % 10;
        num = num / 10;
        str[len - (i + 1)] = rem + '0';
    }
    str[len] = '\0';
}

int toint(char str[])
{
    int len = strlen(str);
    int i, num = 0;

    for (i = 0; i < len; i++)
    {
        num = num + ((str[len - (i + 1)] - '0') * pow(10, i));
    }

   return num;
}


Output:

Enter a number: 12345
Number converted to string: 12345
Number converted back to integer: 12345


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