Informatics3-2024/Solutions4

Kkovacs (vitalap | szerkesztései)
(Új oldal, tartalma: „== Solutions == Only the solutions we discussed on the practical will be here. All the other tasks are perfect to practice for the written exam. ==== Centroid (from t…”)

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Solutions

Only the solutions we discussed on the practical will be here. All the other tasks are perfect to practice for the written exam.

Centroid (from the previous practical)

#include<iostream>
using namespace std;
 
float avg(float t[], int n) {
  float s = 0.0;
  for(int i = 0; i < n; i++) {
    s += t[i];
  }
  return s / n;
}
 
int main(void) {
  float x[10];
  float y[10];
  float z[10];
  cin >> x[0];
  cin >> y[0];
  cin >> z[0];
  int i = 0;
  while(x[i] != 0 || y[i] != 0 || z[i] != 0) {
    i++;
    cin >> x[i];
    cin >> y[i];
    cin >> z[i];
  }
  cout << "(" << avg(x, i) << ", " << avg(y, i) << ", " << avg(z, i) << ")" << endl;
 
  return 0;
}

Second step:

#include<iostream>
using namespace std;
 
float avg(float t[], int n) {
  float s = 0.0;
  for(int i = 0; i < n; i++) {
    s += t[i];
  }
  return s / n;
}
 
int main(void) {
  float *x;
  float *y;
  float *z;
  int n;
  cin >> n;
  x = new float[n];
  y = new float[n];
  z = new float[n];
  for(int i = 0; i < n; i++) {
    cin >> x[i];
    cin >> y[i];
    cin >> z[i];
  }
  cout << "(" << avg(x, n) << ", " << avg(y, n) << ", " << avg(z, n) << ")" << endl;
 
  delete[] x;
  delete[] y;
  delete[] z;
 
  return 0;
}

String slice

#include<iostream>
 
using namespace std;
 
char* slice(char* str, int n, int m) {
  int size = m - n + 2;
 
  char* retval = new char[size];
  for(int i = 0; i < size; i++) {
    retval[i] = str[i + n];
  }
 
  retval[size - 1] = '\0';
 
  return retval;
}
 
int main(void) {
 
  char c[] = "batman";
  char* s = slice(c, 1, 4);
 
  cout << s << endl;
 
  delete[] s;
 
  return 0;
}