How to convert integer value to string in C langauge?

Answer 1

#include <stdio.h>
...
int value = 0;
char textvalue[30] = "";
...
snprintf(textvalue, sizeof(textvalue), "%d", value);

Answer 2

Means do you want to convert
1 to '1'
Or
1 to 'A'

in either case you can make use of the fact that characters are represented by their ASCII values which are integers.

Answer 3

https://www.cplusplus.com/reference/cstdlib/itoa/

Answer 4

Arsenic 12 to "12" so that i concatenate to some other string