Introduction To Computer Programming Laboratory Source code of a computer program is given below. What do you expect to be displayed?

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1 Introduction To Computer Programming Laboratory Source code of a computer program is given below. What do you expect to be displayed? int a = 1; void fn(void); int a = 2; int a = 3; a++; fn(); void fn(void) return; 2. A computer receives an integer and prime factorization of the entered value is displayed. If the entered value is negative, prime factorization of its absolute value is displayed. Write C code. int isprime(int N) if(n<2) int n, N_is_prime = 1; n=2; while(n<n) if(n%n==0) N_is_prime = 0;

2 break; n++; return N_is_prime; int number, prime, times; printf("enter an integer:"); scanf("%d", &number); number = number < 0? -number : number; printf("%d =", number); prime = 2; while(number > 1) times = 0; while(!isprime(prime)) prime++; while(number % prime == 0) number /= prime; times++; if(times > 0) printf(" %d^%d ", prime, times); prime++; 3. X, Y and Z are arrays. X stores values 5, 0, 6. Y stores values 1, 5, 9, 3, 8. Z has no values stored but can store 8 elements. Declare and initialize the arrays, displays values stored. Write C code. int X[] = 5, 0, 6;

3 int Y[5] = 1, 5, 9, 3, 8; int Z[8]; int i; printf("x="); for(i=0; i<3; i++) printf("%d", X[i]); if(i!=2) printf(", "); printf("y="); for(i=0; i<5; i++) printf("%d", Y[i]); if(i!=5) printf(", "); printf("z="); for(i=0; i<8; i++) printf("%d", Z[i]); if(i!=8) printf(", "); 4. An array with 100 elements have values described as; e index if index is odd, and ln(index) in index is even. The array is displayed one element value per line with index. Write C code. #include <math.h> double arr[100]; int i; for(i=0; i<100; i++) if(i%2==0) arr[i] = log(i);

4 arr[i] = exp(i); for(i=0; i<100; i++) printf("%2d\t%lf\t\t", i, arr[i]); i++; printf("%2d\t%lf\n", i, arr[i]); 5. A computer program stores 2D coordinates in an array. User enter coordinates for two 2D coordinates and distance between coordinates are computed and displayed. Write C code. Use double pow(double base, double exponent) and double sqrt(double x) functions from math.h library. #define TWODCOORDSIZE 2 #define XCOORD 0 #define YCOORD 1 double p1[twodcoordsize], p2[twodcoordsize]; double dist; printf("enter x and y for first point:\n"); scanf("%lf %lf", &p1[xcoord], &p1[ycoord]); printf("enter x and y for second point:\n"); scanf("%lf %lf", &p2[xcoord], &p2[ycoord]); dist = sqrt( pow(p1[xcoord]-p2[xcoord], 2) + pow(p1[ycoord]-p2[ycoord], 2) ); printf("distance between points: %lf\n", dist); 6. A computer program generates 10 random numbers and stores them in an array. The values are displayed after generation. Write C code. Use time_t time(time_t* timer) function from time.h library, void srand(unsigned int seed) and int rand(void) functions from stdlib.h library for random number generation. #include <stdlib.h> #include <time.h> #define NoR 10

5 int randoms[nor]; int r; srand(time(null)); randoms[r] = rand(); printf("%2d: %d\n", r, randoms[r]); 7. A computer program generates 10 random numbers and stores them in an array. The values are sorted largest to smallest, i.e. the largest value is the first element in the array. The values are displayed after sorting. Write C code. #include <stdlib.h> #include <time.h> #define NoR 10 int randoms[nor]; int r, s, temp;; srand(time(null)); randoms[r] = rand(); for(s=r+1; s<nor; s++) if(randoms[r] < randoms[s]) temp = randoms[r]; randoms[r] = randoms[s]; randoms[s] = temp;

6 printf("%2d: %d\n", r, randoms[r]); 8. A computer program receives an integer, uses a function that decomposes the value to digits and stores the digits in an array, and uses another function that recomposes the value from digits array. Write C code for program and functions. #include <math.h> int digit_count(int N) N = N>0? N : -N; int dcount = 0; while(n>0) dcount++; N/=10; return dcount; int decompose_to_digits(int number, int darr[], int darrsize) number = number>0? number : -number; if(digit_count(number) > darrsize) printf("error: decompose_to_digits: digits array does not have enough space to store digits.\n"); // ERROR int n; for(n=0; n<darrsize; n++) darr[n] = 0; n=0; while(number>0) darr[n] = number % 10; number /= 10; n++;

7 return n; // SUCCESS. digit count is returned. int recompose_from_digits(int darr[], int darrsize) int n, N = 0; N=0; for(n=0; n<darrsize; n++) N += darr[n]*pow(10, n); return N; #define NoD 16 int number, number2; int digits[nod]; int digit_count; int n; printf("enter an integer:"); scanf("%d", &number); digit_count = decompose_to_digits(number, digits, NoD); if(digit_count==0) printf("not enough space in the array for digits.\n"); printf("digits of %d: ", number); for(n=0; n<digit_count; n++) printf("%d ", digits[n]); number2 = recompose_from_digits(digits, NoD); printf("recomposed integer: %d\n", number2);