Ceng 198 Introduction to Programming
Final
May 28, 2008 09.00 - 10.50
Good Luck!

1. (40 pts) Write a complete C program that makes a call to a function that will take an array of size 250 as an argument.
   • The array should be filled with random numbers from 1-100. The filling of the array will be done within the same function.
   • The print out of the numbers with their indices will also be done in the function.
   • The function shoul also find/calculate and then print out the following properties of the array;
     • the maximum and corresponding index,
     • the minimum and corresponding index,
     • the arithmetic mean (average, $\overline{x}$),
     • the standard deviation $\sigma = \sqrt{\frac{1}{N} \sum_{i=1}^N(x_i- \overline{x})^2}$, where $x$ is the name of the array, $i$ is the array index and $N$ is the size of the array (250).
   • The function will not return anything.

   #include <stdio.h>
   #include <stdlib.h>
   #include <time.h>
   #include <math.h>
   #define SIZE 250
   void myfunction(int arrayinfunction[], int size);
   int main()
   {
     int arrayinmain[SIZE];
     myfunction(arrayinmain, SIZE);
     return 0;
   }
   void myfunction(int arrayinfunction[], int size)
   {
     int i, min, max, minIndex, maxIndex;
     float average, sum, sigma;
     srand(time(0));
     for (i = 0; i < size; i++)
       arrayinfunction[i] =1+rand()%100;
     for (i = 0; i < size; i++)
       printf("number=%d index=%d \n",arrayinfunction[i],i);
     /*Maximum and corresponding index*/
     max = arrayinfunction[0];
     for (i = 1; i < size; i++)
       if (arrayinfunction[i] > max)
         {
   	max = arrayinfunction[i];
   	maxIndex = i;
         }
     printf("Max. Number: %d, Index of Max. Number: %d\n", max, maxIndex);
     /*Minimum and corresponding index*/
     min = arrayinfunction[0];
     for (i = 1; i < size; i++)
       if (arrayinfunction[i] < min)
         {
   	min = arrayinfunction[i];
   	minIndex = i;
         }
     printf("Min. Number: %d, Index of Min. Number: %d\n", min, minIndex);
     /*Arithmetic Mean*/
     sum=0.0;
     for (i = 0; i < size; i++)
       sum=sum+arrayinfunction[i];
     average=sum/size;
     printf("Arithmetic mean (average) of %d numbers is %f \n", size, average);
     /*Standart Deviation*/
     sum=0.0;
     for (i = 0; i < size; i++)
       sum=sum+(arrayinfunction[i]-average)*(arrayinfunction[i]-average);
     sigma=sqrt(sum/size);
     printf("Standart deviation is %f \n", sigma);
     return;
   }
   

2. (25 pts) Define a function with the name ```Calculator''
   • that takes 3 parameters; first operand with data type float, second operand with data tpye float and the operator with data type chratacter.
   • The function should make a calculation according to the given character and then return the value calculated to main.
   • These three parameters and resulting calculated value should be printed out in tne main function.

   #include <stdio.h>
   float simpleCalculator(float, char, float);
   int main()
   {
     float firstOp, secondOp,result;
     char oper;
     printf("Enter operator (+,-,*, or /): ");
     scanf("%c", &oper);  
     printf("Enter first operand: ");
     scanf("%f", &firstOp);
     printf("Enter second operand: ");
     scanf("%f", &secondOp);
     result = simpleCalculator(firstOp, oper, secondOp);
     printf("Result of the operation %f %c %f is %f\n", firstOp, oper, secondOp,
             result);
     return 0;
   }
   float simpleCalculator(float fo, char op, float so)
   {
     if(op == '+')
       return fo + so;
     else if(op == '-')
       return fo - so;
     else if(op == '*')
       return fo * so;
     return fo / so;
   }
   

3. (25 pts) Write a complete C program that makes a call to a function
   • that takes three arguments: a character and two integers.
   • The character is to be printed as
     • the first integer specifies the number of times that the character is to be printed on a line,
     • the second integer specifies the number of lines that are to be printed.

   #include <stdio.h>
   void printcharacter();
   int main()
   {
     printcharacter();
     return 0;
   }
   void printcharacter()
   {
     int i,j,integer1, integer2;
     char character;
     printf("Enter character : ");
     scanf("%c", &character);
     printf("Enter first integer: ");
     scanf("%d", &integer1);
     printf("Enter second integer: ");
     scanf("%d", &integer2);
     for(i=1;i<=integer2;i++)
       {
         for(j=1;j<=integer1;j++)
   	printf("%c",character);
         printf("\n");
       }  
     return;
   }
   

4. (20 pts) A palindrome is a number or a text phrase that reads the same backwards as forwards. For example, each of the following five-digit integers is a palindrome: 12321, 55555, 45554 and 11611. Write a complete C program that reads in a five-digit integer and determines whether it is a palindrome.
   Hints:
   • Use the division and modulus operators to seperate the number into its individual digits.
   • Store each digit in its own variable.

   #include<stdio.h>
   int main(void)
   {
     int i,number, onlar=10,a,b,c,d,e;
     printf("Enter a five-digit integer : ");
     scanf(" %d",&number);
     //   printf("number = %d \n",number);
     a=number%onlar;
     number=number/onlar;
     b=number%onlar;
     number=number/onlar;
     c=number%onlar;
     number=number/onlar;
     d=number%onlar;
     number=number/onlar;
     e=number%onlar;
     printf("a=%d b=%d c=%d d=%d e=%d \n",a,b,c,d,e);
     if(a==e && b==d)  
       printf("Entered number %d%d%d%d%d is a palindrome\n",e,d,c,b,a); 
     else 
       printf("Entered number %d%d%d%d%d is NOT a palindrome\n",e,d,c,b,a);
     return 0;
   }