Lab 10 Answer Sheet

This lab is to be worked in a group.

Name:________________________Netid:_______________Section:_______

Part 1: Prelab

1. 
   
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2. ___________________________________
   
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3.  
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4. 
   
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5. 
   }
   
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6. Complete the following program that prompts a user for her first name and then reads the name and responds with a personal greeting.
   For example:
   Enter your first name: Sue
   Hello Sue !
   
   #include <stdio.h>
   #include <string.h>
   
   void main(void)
   {
      char fname[72];
      char greeting[132];
      printf("Enter your first name: ");
   
   
      scanf("%s", ________________________________);
      strcpy(greeting , "Hello ");
      strcat(greeting , fname);
      strcat(greeting , " !");
      printf(" %s \n", greeting);
   }

7. 
   
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8. Circle the correct Answer

        a. int addTen(int x[ ]);
        b. int addTen(int y); 
        c. int AddTen( int); 
        d. void plus_ten( int);
       

9. 
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Part 2: Function call (pass by value and pass by reference)

1. To see how variables are modified in by functions in c, write the output when the following program executes.

#include <stdio.h>
void dosumpin(int a, double b[]);  /* prototype */
int didsumpin(int d, double e[]);  /* prototype */
void main(void)
{
 int a = 1;
 int c;
 double b[2] = {2.0,1.0};
 
 dosumpin(a,b);
 printf("a = %i b[0] = %lf  b[1] = %lf\n",a, b[0], b[1]);
 dosumpin(a,b);
 printf("a = %i b[0] = %lf b[1] = %lf\n",a, b[0], b[1]);
 b[0] = 2.0;
 b[1] = 1.0;
 c = didsumpin(a,b);
 printf("a = %i b[0] = %lf b[1] = %lf c = %i\n",a , b[0], b[1], c);
}

/* Note dosumpin assigns a value to the integer (a) (a = 8;), but the value of (a) in main is unmodified. However the changes to the array (b) are carried through to main*/
void dosumpin(int a, double b[])
{
 b[0] = b[0] + a;
 b[1] = b[1] + a;
 a = 8;
}
int didsumpin(int d, double e[])
{
 e[0] = e[0] + d;
 e[1] = e[1] + d;
 return 2*d;
}

a = ________________ b[0] = _______________ b[1] = _______________


a = ________________ b[0] = _______________ b[1] = _______________


a = ________________ b[0] = _______________ b[1] = _______________ c = _________________

Part 3: String Matching and Statistics

1. How many times does the word 'the' appear? (Exact Match)
   
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2. How many occurrence of 'the' are there? (Partial Match)
   
   
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3. What is the average length of the words in the file illini.txt ?
   
   
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