how to convert integer into double C= code example

Example 1: casting in c

#include <stdio.h>
#include <stdlib.h>
int main(){
  int x = 7, y = 5;
  float z;
  z = (float)x / (float)y;   /*Here the value of z is 1.400000*/
  return 0;
}

Example 2: int to double c

int vIn = 0;
double vOut = (double)vIn;