1) Figure out what the expression and/or statements evaluate to or print.
2) Short answer or fill-in the blank about C.

Note - they're a bit mixed up in this file ...


1a)
char c[10] = "jklmno";
for(int i=0; i<26; i++){
  c[i] += 2;
}
printf("%s\n", c);

answer:


2a)
What is the difference between a signed integer and unsigned integer?
Specifically, what is the difference between  
  int x;
  unsigned int y;

answer:


1b)
int i = 64;
i = i << 1;
i = i | 0x12;
i = i >> 3;
printf("%i\n", i); 

Answer:


2b)
What keyword identifies a loop that keeps track of a variable for you?
Answer: for
** Note - this question is both too vague and too easy.



1c) 
  int num = 123456;
  int i;
  for(i=0;i<3;i++)
    num1 = num1 + (1 << i); 
  printf("%d",num1);
  
  what is the value of num1?
  answer: 
 

2c) (True/False) A variable of an enumerated (enum) type only takes one value?
  Answer: True
** Note: question is vague and could be misunderstood.


1d)
int a = 0x00; 

a |= 0xab; 
a &= 0x0f; 
a = ~a;    
a >> 2;    

printf("%d %x\n", a, a); 


2d)
What is struct used for?
Struct is used for collecting variables that are related to create a new type.
** Note - too vague, it is better to ask something specific where it is
easy to determine if you are correct or not.


1e) 
int main()
	int x=50;
	x = x%3+5;
	x = x>>1;
	printf("%d\n", x);

Answer:


2e) How many bytes does a long double take in memory when using gcc on CS?
Answer:  (use sizeof)


1f)

int i;
char c[10] = "abcdef";
for (i = 0; c[i]; i++)
  c[i] += c[i] & 0x1;
printf("%s\n", c);

Answer: 


1g) 
int i;
char c[100] = "HeLLoWoRLD";
for (i = 0; c[i]; i++)
  printf("c[%d] '%c' -> %s\n", i, c[i], (c[i] & 32) ? "false":"true");

Answer:



1h).
  char c = 'a';
  c += 4 + ('X'-'W');
  c -= 2*2-1;
  c -= ('a'-'A');
  printf("%c\n", c);
  printf("%d\n", c);
answer: 
        

2f.
  What happens when you use return in a function?
Answer: The function is terminated and the value is returned.
** Note - too easy?


1i)
int num = 70%8*2+4%3;


2g)
What is the storage size and value range of an unsigned char on CS with gcc?
** Note - very nice, specific enough to easily tell if someone knows this or not based on their answer


1j)

int main(int argc, char *argv[]){
  char c = 'c';
  c += c>>2;
  for(int i=1; i<4;i++)
    c = ++c | i;
  printf("%i\n", c); //prints 127
}



2h)
What does the variable argc contain?
Answer: the number of command lines arguments



1k)
#include<stdio.h>
#include<stdlib.h>

int main(int argc,char *argv[]){
  float number=10;

  for(int i=0; i<=number; i++){
    printf("%.0lf x %d = %.0lf\n", number, i, i*number);
  }
  printf("------------------\n");
  for (int k=1; k<=number; k++){
    printf("%.0lf / %d = %.2lf\n", number, k, number/k);
  }
  return 0;
}


2i)
What is a SWITCH statement in C?
Answer:
** Note -- too vague