Print Table Using While Loop in C++
Multiplication Table
In mathematics, a table is created by multiplying a certain number by all of the counting numbers, i.e., 1, 2, 3, 4, 5, 6, and so on. It is also referred to as a multiplication table. Suppose, we need to create a table of the number 12, then we have to multiply 12 by each natural number as follows:
12 * 1 = 12
12 * 2 = 24
12 * 3 = 36
12 * 4 = 48
12 * 5 = 60....
What is while Loop?
A while loop or while statement repeats all code of its body as long as a specific condition is satisfied. The loop ends if or when the condition no longer met.
The syntax of the while loop
while(condition)
{
statement(x);
}
Algorithm to print Multiplication of Table 2:
Step 1: Start.
Step 2: Read n, res, i.
Step 3: Take a number “n” from the user to print the table.
Step 4: Use for-loop to print table. Initialize (i=1) and check condition until i becomes 12. when, the condition becomes wrong, then control moves to step 6..
Step 5: res=num*i;
Step 6: Print “res”.
Step 7: End.
Program 1:
#include<iostream>
using namespace std;
int main()
{
int num=2, i, res;
i=1;
while(i<=12){
res = num*i;
cout<<num<<" * "<<i<<" = "<<res;
cout<<endl;
i++;
}
cout<<endl;
return 0;
}
Output
2 * 1 = 2
2 * 2 = 4
2 * 3 = 6
2 * 4 = 8
2 * 5 = 10
2 * 6 = 12
2 * 7 = 14
2 * 8 = 16
2 * 9 = 18
2 * 10 = 20
2 * 11 = 22
2 * 12 = 24
Explanation
The above code prints the table of 2.
The while loop is used in this program. The value of i is initialized to 1, and the condition (i<12) is evaluates to true because (1<12), which allows the program to enter in while loop. And, res stores the value of num*i, i.e., 2*1, i.e., 2.
Now, use the following statement:
cout<<num<<" * "<<i<<" = "<<res;
The above statement prints the first line like this 2 *1 = 2 in the output.
In the loop, cout<<endl is next statement that indicates the program will write the output from new line.
The program flow moves to the update statement which increases the value of i. Consequently, i=2
The condition i<12 or 2<12 evaluates to true once more. Again, control enters in the loop.
This process will continue until the condition is determined to be untrue.
The multiplication table of 2 is printed on the output screen.
Program 2: Program to print a table of a number defined by user at run time:
#include<iostream>
using namespace std;
int main()
{
int num, i, res;
cout<<"Enter the Number: ";
cin>>num;
i=1;
while(i<10){
res = num*i;
cout<<num<<" * "<<i<<" = "<<res;
cout<<endl;
i++;
}
cout<<endl;
return 0;
}
Output
Enter a number: 10
10 * 1 = 10
10 * 2 = 20
10 * 3 = 30
10 * 4 = 40
10 * 5 = 50
10 * 6 = 60
10 * 7 = 70
10 * 8 = 80
10 * 9 = 90
10 * 10 = 100
Print table from 1 to 10
Algorithm:
Step 1: Start the program.
Step 2: Read n, i=1, j=1.
Step 3: Use two do-while loops to print the tables. Iterate the value of i until i=10. In the inner loop iterate j until (j<=n), else go to step4.
Step 4: if (j<n-1)
Cout<<j<<”x”<<i<<i*j
Else
Cout<<j<<”x”<<i<<i*j
Step 5: End the program.
Flowchart:
Program:
#include <iostream>
using namespace std;
int main()
{
int j, i, n;
cout << "\n\n the multipliaction table from 1 to n:\n";
cout << "-------------------------------------------------------------\n";
cout << "Input the number upto 5: ";
cin >> n;
cout << "Multiplication table from 1 to " << n << endl;
i=1;
while(i<=10)
{
j=1;
while(j<=n)
{
if (j <= n - 1)
cout<<j<<"x"<<i<<"="<<i*j<<"\t";
else
cout<<j<<"x"<<i<< "=" <<i*j<<endl;
j++;
}
i++;
cout << endl;
}
}
Output
Enter any number:
The multiplication table from 1 to 4
1x1=1 2x1=2 3x1=3 4x1=4
1x2=2 2x2=4 3x2=6 4x2=8
1x3=3 2x3=6 3x3=9 4x3=12
1x4=4 2x4=8 3x4=12 4x4=16
1x5=5 2x5=10 3x5=15 4x5=20
1x6=6 2x6=12 3x6=18 4x6=24
1x7=7 2x7=14 3x7=21 4x7=28
1x8=8 2x8=16 3x8=24 4x8=32
1x9=9 2x9=18 3x9=27 4x9=36
1x10=10 2x10=20 3x10=30 4x10=40
Program to print table using recursive:
#include <iostream>
using namespace std;
void mul_table(int N, int i)
{
// Base Case
if (i > 10)
return;
cout << N << " * " << i << " = " << N * i << endl;
return mul_table(N, i + 1);
}
// Driver Code
int main()
{
int N = 7;
mul_table(N, 1);
return 0;
}
Output
7 * 1 = 7
7 * 2 = 14
7 * 3 = 21
7 * 4 = 28
7 * 5 = 35
7 * 6 = 42
7 * 7 = 48
7 * 8 = 56
7 * 9 = 63
7 * 10 = 70