Chapter2 
Selftest2.txt
John Stile

1. What do each of the following code fragments mean?
a.) if (aa > 75_)    // True if variable aa contains a value lager than 75
b.) if (aa > bb)     // True if variable aa contains a value larger than variable bb
c.) void cc (int xx) // Header for funciton cc, which takes an int (referred to as variable x inside function) and returns nothing.
d.) cc(7);           // Call function cc, sending an argument of 7
e.) int dd(int)      // Header for function dd, which takes an int and returns and int.
f.) yy=dd(25);       // Call function cc, sending it 25, and assign the return value to variable yy
g.) for ( yy=0; yy<24; yy=yy+2)  // loop through 0 to 24, stepping 2 (every even number)
    {                            // start loop  execution
      printf("yy is %d \n", yy); // print "yy is <value> <newline", where value will be 0,2,4,...,24.
    }                            // end loop execution
h.) while(aa<9)      // as long as variable aa < 9, do what is between the loop execution braces.
i.) int dd[3]={27,31,57} // declare and assign an array of ints called dd, containing the 3 elements: 27,31,57
j.) char ff[6]={'C','I','a','i','r'};  // declare and assign an array of chars called ff, containing 6 elements: C, I, a, i, r
k.) int * pvar;      // declare an int pointer to named pvar
l.) pvar = &cc;      // assign the address of variable cc to pointer pvar
m.) xx=(*pvar) * (*pvar); // multipy the value in the variable pvar pointer points to by it self, and assign the value to variable xx 
n.) sturct employee // declare struct named employee

2. Correct the errors in the following code fragments:
a) if (xx<5);                             if (xx<5)
                                          {
   printf("False.\n");                      printf("False.\n"); 
                                          }
b) for (xx=1, xx<100, xx=xx+1)            for (xx=1; xx<100; xx=xx+1)   
                                          {
     printf("The value is %d\n", xx);       printf("The value is %d\n", xx);
                                          }
c) struct info                            struct info
   {                                      {
     char name[20]; int sal;                char name[20];
                                            int sal;
   }                                      }
   struct info emp1={90000,"LINUXGURU"}   struct info emp1={"LINUXGURU", 90000};

3.  What is output when the following program is executed?
#include <stdio.h>   // include functions from stdio.h lib when compiling this code
int main(void)       // header for main function block
{                    // start main funciton block
  int num;           // decalre variable num of type int
  int * pnum;        // declare pointer named pnum of type int pointer
  num=8;             // assign num value of 8
  pnum=&num;         // assing int pointer pnum address of int variable num.
  printf("The value of num is %d\n", num); // Print the  value in num (aka 8)
  *pnum=(*pnum)*(*pnum);                   // multply 8 * 8 and store in variable num
  printf("The value fo the num is %d\n", num); // Print the  value in num (aka 64)
  return 0;                                    // Return 0 from function main
}                    // exit main funciton block

4. write a program named larger.c that uses two variables. 
   have the program ask the user for an integer and read the user's response, 
   saving the response in the memory address of the variable abc.
   Do the same for the second integer in placing the result in def.
   Have the program output which ever number is greater.
#include <stdio.h>
void main(int)
{