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Computer Laboratory 8

The document outlines four tasks related to C++ programming, focusing on the use of references, pointers, and arrays. Each task includes a code snippet that demonstrates the concepts, along with instructions to save, compile, and run the programs. The final task requires writing a function to find the maximum value in a float array and return a pointer to it.

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32 views2 pages

Computer Laboratory 8

The document outlines four tasks related to C++ programming, focusing on the use of references, pointers, and arrays. Each task includes a code snippet that demonstrates the concepts, along with instructions to save, compile, and run the programs. The final task requires writing a function to find the maximum value in a float array and return a pointer to it.

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bndgdd cncncj
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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COMPUTER LABORATORY 8

Task1: Copy the program given below. Save (as ref.cpp). Compile and run it.
// Use of the references
#include <iostream>
using namespace std;
int main(){
float n = 25.5; // the target
float &r1 = n; // alias of the target
float &r2 = n; // another alias of the target
cout << "n, r1, r2 = " << n << '\t' << r1 << '\t' << r2<< endl;
n = -4.2e-2;
cout << "n, r1, r2 = " << n << '\t' << r1 << '\t' << r2<< endl;
r1 = 12.55;
cout << "n, r1, r2 = " << n << '\t' << r1 << '\t' << r2<< endl;
//addresses
cout << "&n, &r1, &r2 = " << &n << '\t' << &r1 << '\t' << &r2<< endl;
return 0;
}

Task2: Copy the program given below. Save (as ptr.cpp). Compile and run it.
// Use of pointers
#include <iostream>
using namespace std;
int main(){
int n = 25;
int *pn;
pn = &n; // pn points to n

cout << "n = " << n << '\n' << "&n = " << &n << endl;
cout << "pn = " << pn << '\n' << "&pn = " << &pn << endl << endl;
*pn = 70;
// *pn is the alias of n
cout << "n = " << n << '\n' << "*pn = " << *pn << endl;
return 0;
}

Task3: Copy the program given below. Save (as ptrArrays.cpp). Compile and run it.
// Use of pointers and arrays
#include <iostream>
int main(){
float a[5];
float *p;
p = a; // p holds the adr. of the 1st element of a
*p = 1.5; // that means a[0] = 1.5;
*(p+1) = 2.2;
*(p+2) = 7.1;
*(p+3) = 8.3;
*(p+4) = 9.9;
std::cout << " a[i]: ";
for (int i=0; i<5; i++) std::cout << a[i] << " ";
std::cout << std::endl;
std::cout << "*(p+i): ";
for (int i=0; i<5; i++) std::cout << *(p+i) << " ";
std::cout << std::endl;
return 0;
}

Task4: Write a function named float* max (float a[], int n) that is passed a float
array of size n and returns a pointer to the maximum of the n floats. Use this
program in a suitable main program.

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