// Andrew Taylor - andrewt@unsw.edu.au
// 08/06/2020

// Examples of illegal bit-shift operations

#include <stdio.h>
#include <stdint.h>

int main(void) {
    // int16_t is a signed type (-32768..32767)
    // below operations are undefined for a signed type
    int16_t i;

    i = -1;
    i = i >> 1; // undefined -  shift of a negative value
    printf("%d\n", i); 

    //   i = -1;
    //   i = i << 1; // undefined -  shift of a negative value
    //   printf("%d\n", i);

     i = 32767;
     i = i << 1; // undefined -  left shift produces a negative value
     printf("%d\n", i);
    
     
    uint64_t j;   
    //j = 1 << 33; // undefined - constant 1 is an int
    uint64_t one = 1;
    j = one << 33;
    j = 1ul << 33;
    j = ((uint64_t)1) << 33; // ok
    printf("%ld\n",j);
    
    uint32_t k;
    //k = 1 << 31; // constant 1 is an int!! This is a signed shift
    k = 1u << 31; //This is ok.
    printf("%u\n",k);
    return 0;
}