Challenging C++ Exercises with Solutions

For those studying C++ and in search of exemplary C++ exercises to deepen their understanding and elevate their C++ knowledge, we extend an invitation to explore and download the compilation of challenging C++ exercises with solutions shared below.

Presented here are fundamental C++ exercises with solutions. You can access additional basic and advanced C++ exercises via the link provided at the end of this article.

C++ Function Exercises

1. Find the greatest common divisor of two numbers, a and b.

#include 
using namespace std;
int gcd(int, int);
int gcd(int x, int y){
if (x < y){
x = x + y;
y = x - y;
x = x - y;
}
while (y != 0){
int m = x%y;
x = y;
y = m;
}
return x;
}
int main()
{
int a, b;
cin >> a >> b;
cout << gcd(a, b);
return 0;
}

2. Write a program using a function to check for a leap year.

#include 
#include 
int isLeapYear(int y)
{ return y % 4 == 0 && (y % 100 != 0 || y % 400 == 0);}
void main()
{
int n;
do
{
cin >> n;
if (isLeapYear(n)) cout << n << ' is a leap year.\n'; else cout << n << ' is not a leap year.\n';
}
while (n>1);
}

C++ Control Statements Exercises

Input an integer, then output the hundreds digit of that number, or 0 if there isn't one.

Example:

#include 
using namespace std;
int main()
{
int n, i;
cin >> n;
i = 0;
if (n < 100) {
cout << i << endl;
}
else {
i = n / 100 % 10;
cout << i << endl;
}
return 0;
}

C++ String Exercises

1. Write a program to remove the character 'a' from a string.

#include 
#include 
#include 
void main()
{
int i,j; char x[80];
cout<<'
Enter a string : '; gets(x);
for (i=j=0;x[i]!=NULL;i++) if (x[i]!='a')
{
x[j]=x[i]; j++;
}
x[j]= NULL;
cout<<'
The string after removing 'a' is:'; puts(x);
getch();
}

2. Write a program to extract the left substring of a string.

#include  #include 
#include  void main()
{
	clrscr();
	char ten[25], *tentro; tentro=ten;
	int i,sokytu;
	cout
  

    
  
  <<'
Enter a string of characters : '; gets(ten);
	cout<<'
How many characters do you want to extract :'; cin>>sokytu;
	for (i=0;i

C++ Array and Pointers Exercises

1. Find the smallest and largest numbers in an array.

#include 
using namespace std;
int main()
{
int a[100];
int n = 0;
int x;
while (cin >> x) {
a[n] = x;
n++;
}
int maxval = a[0], minval = a[0];
for (int i = 1; i < n; i++) {
if (maxval < a[i])
maxval = a[i];
if (minval > a[i])
minval = a[i];
}
cout << minval << endl;
cout << maxval << endl;
return 0;
}

2. Write a program to input a real matrix of up to 20x20 and find the maximum value among the elements of the matrix.

#include  #include  void main()
{
float a[20][20],smax; int m,n,i,j,imax,jmax; clrscr();
puts('Enter the number of rows and columns of the matrix: '); scanf('%d%d',&m,&n);
for (i=0;i

C++ Input Output Exercises

1. Input a character, then output its ASCII code.

Example:

#include 
using namespace std;
int main()
{
char m;
cin >> m;
cout << int(m);
return 0;
}

2. Input a two-digit number, then output the sum of its digits to the screen.

Example:

#include 
using namespace std;
int main()
{
int a;
cin >> a;
cout << a%10 + a/10;
return 0;
}

C++ Loop Exercises

1. Input an integer n, output the sum of all odd numbers from 1 to n.

Example:

#include 
using namespace std;
int main()
{
int n , s = 0;
cin>>n;
for(int i=1; i<=n; i=i+2)
{
s = s+i;
}
cout << s;
return 0;
}

2. Input an integer n, output n!

Example:

#include 
using namespace std;
int main()
{
int n , factorial = 1;
cin  >> n;
for  (int i = 1; i <= n; i++) {
factorial  = factorial*i;
}
cout  << factorial << endl;
return 0;
}

C++ File Handling Exercises

Write a program to perform the following tasks:

• Input 10 real numbers into a text file named INPUT.
• Read the contents of file INPUT.
• Calculate the sum of squares of the numbers in file INPUT.

#include  #include  #include 
void write()
{FILE *f = fopen('input','wt');
/*Write 10 real numbers into the text file*/
for (int i=1; i<=10;i++)
{ float a;
printf('\n Enter number %d: ',i); scanf('%f', &a);
fprintf(f,'%f ',a);
}
fclose(f);
}
void read()
{ int i;float a;
FILE *f = fopen('input','rt'); printf('\n Contents of the file are: \n\n'); do
{ fscanf(f,'%f',&a);
if (!feof(f))
printf('%.2f ',a);
} while (!feof(f)); fclose(f);
}
float tongbp()
{ int i;float tong = 0;
FILE *f = fopen('input','rt'); do
{ float a; fscanf(f,'%f',&a);
if (!feof(f)) tong+=a*a;
}while (!feof(f)); fclose(f);
return tong;
}
void main()
{ clrscr();
write();
read();
printf('\n Sum of squares is %.2f \n ',tongbp()); getch();
}

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awesome-cpp-exercises-with-solutions.rar

So here we have compiled some excellent C++ exercises with solutions for you to download and review the code. Hope you will gain more valuable knowledge to enhance your skills in C++. Wishing you all the best for success!