How to convert integer to string in C?

Question

I tried this example: /* itoa example */ #include <stdio.h> #include <stdlib.h> int main () { int i; char buffer [33]; printf ("Enter a number: "); scanf ("%d",&i); itoa (i,buffer,10); printf ("decimal: %s\\n",buffer); itoa (i,buffer,16); printf ("hexadecimal: %s\\n",buffer); itoa (i,buffer,2); printf ("binary: %s\\n",buffer); return 0; }but the example there doesn't work (it says the function `itoa` doesn't exist).

Answer 1

Your question is how to convert an integer into a string.

One way is to use sprintf as seen in the code snippet below.

However, itoa does work just fine, and converts to binary and hex.

Make sure you are including the proper header files. You need

stdlib.h and string.h.

Otherwise , there may be a compiler glitch as to why those headers

cannot be found, pre-processed, compiled, and linked. Usually, it

is a directory issue... the compiler is not looking into the proper folder

for the headers, OR the headers are not there for whatever reason.

THe following code snippet works correctly in Bloodshed IDE:

==========================================================

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

int main()

{

int a=100;

char buffer[20];

itoa(a,buffer,2); // here 2 means binary

printf("Binary value = %s\n", buffer);

itoa(a,buffer,10); // here 10 means decimal

printf("Decimal value = %s\n", buffer);

itoa(a,buffer,16); // here 16 means Hexadecimal

printf("Hexadecimal value = %s\n", buffer);

//writes a to the buffer

sprintf(buffer,"%d",a);

printf(">%s<",buffer);

return 0;

}