Console I/O functions

// C language sample program
// Console I/O functions

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

//// Variable definitions ////

char c;
char buff[60];
int n;
/////// Main Program //////////
void
main()
{    printf("Sample program : Console input/output\n\n");
     printf("Enter a letter : ");
     gets(buff); if (buff[0]=='\0') // If the 1st character of buff is NULL
     exit(0); // then the string is empty c=buff[0];
     printf("The 1st character is '%c' (%d decimal - %x hex) \n", c,c,c);
     printf("Enter a number < 256 : ");
     scanf("%d", &n); // Use scanf to input numbers
     if (n>255)
        printf("Out of range !\n");
     else
        printf("The character with value %d is %c\n\n", n,n);
}