how to convert an 'integer' to 'string' using C language?

Question

say there is a string and a numeric value
char str[15] = "outref"
int num = 100
i need to append this num to str - so i need to convert 'num' to string value and append it with 'str'. how is it possible?? is there any other way to do it?? please tell me.
thank you

Answer 1

sprintf(newstring, "%s %d", str, num);

Answer 2

im not sure if this works in C, but there is a function called itoa(). to use it:

char str[15] = "outref";
char charnum[10];
int num = 100;

itoa(num, charnum, 10);
strcat(str, charnum);
//now str = outref100

Answer 3

You can do this with sprintf().

int i = 5;
char str[10];

sprintf(str, "blah %i", i); // str is now "blah 5"