#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX 20

int main(void) {

  /* Strings to numbers: */
  int     i = atoi("1234");
  double  d = atof("123.456");
  long    l = atol("12345678");

  char s1[MAX], s2[MAX], s3[MAX];

  printf("i = %i, d = %f, l = %li.\n",
         i, d, l);
  
  /* Numbers to strings: */
  sprintf(s1, "%i",  i);
  sprintf(s2, "%f",  d);
  sprintf(s3, "%li", l);

  printf("s1 = %s, s2 = %s, s3 = %s.\n",
         s1, s2, s3);

  return 0;
}