Error with ToString() - c

Question

I'm new to c. Please help me
Why do I get this error using eclipse
Multiple markers at this line
- request for member 'ToString' in something not a structure or union
- Method 'ToString' could not be resolved
Here is my code
#include <stdio.h>
int main()
{
int s = 5;
int n = 4;
char g = s.ToString();
char l = n.ToString();
printf(g+l);
return 0;
}

Answer 1

s and n are just ints; they don't have a ToString() method. Also, as #remyabel pointed out, char is not the appropriate type for storing a string value, anyway; it stores only one character.
You don't need to convert your ints to strings at all to do what you're trying to accomplish, so you actually want something like this:
#include <stdio.h>
int main()
{
int s = 5;
int n = 4;
printf("%d%d", s, n); // you can't add l to g here!
return 0;
}
// output 54
DEMO
Oh, and please use more descriptive variable names!
EDIT: To save the string, as requested in the comments, you could do this:
char myString[10];
sprintf(myString, "%d%d", s, n); // myString is now "54"

Answer 2

I'd suggest picking up a C tutorial and starting from the beginning. The use of ToString isn't the only thing that's wrong. You could rewrite it this way and it should work (assuming you want to print "54"):
#include <stdio.h>
int main()
{
int s = 5;
int n = 4;
char g = '0' + s;
char l = '0' + n;
printf("%c%c", g, l);
return 0;
}
But this only works as long as s and n are less than 10, and besides is overly complicated since printf is made for formatting and printing values of different types. This would work just as well:
#include <stdio.h>
int main()
{
int s = 5;
int n = 4;
printf("%d%d", s, n);
return 0;
}
If you want to use the string for something else than printing, the answer depends on what you want to do.