How to Convert an Integer to a String in C?

#include <stdio.h>
#include <string.h>

void intToStr(int N, char *str) {
    int i = 0;
  
    // Save the copy of the number for sign
    int sign = N;

    // If the number is negative, make it positive
    if (N < 0)
        N = -N;

    // Extract digits from the number and add them to the
    // string
    while (N > 0) {
      
        // Convert integer digit to character and store
      	// it in the str
        str[i++] = N % 10 + '0';
      	N /= 10;
    } 

    // If the number was negative, add a minus sign to the
    // string
    if (sign < 0) {
        str[i++] = '-';
    }

    // Null-terminate the string
    str[i] = '\0';

    // Reverse the string to get the correct order
    for (int j = 0, k = i - 1; j < k; j++, k--) {
        char temp = str[j];
        str[j] = str[k];
        str[k] = temp;
    }
}

int main() {
    int N = 1234;
    char str[12];

    intToStr(N, str);

    printf("String: %s\n", str);

    return 0;
}

#include <stdio.h>

int main() {
  
    // Integer to be converted
    int N = 86;

    // Buffer to hold the resulting string
    char str[20];

    // Converting integer to string using sprintf
    sprintf(str, "%d", N);

    printf("The integer %d converted to string is: %s\n",
           N, str);

    return 0;
}

#include <stdio.h>
#include <stdlib.h>

int main() {
    int N = 1234;
  
    // Declare a character array 'str' t store the converted
    // string
    char str[12];

    // Calling itoa()
    itoa(N, str, 10);

    printf("String: %s\n", str);
    return 0;
}