Pattern 40 : C Program to print the below Odd Even number pattern
Odd Even Number Pattern Program :
Write a C Program to print below Odd Even Number Pattern on the console using the loops.
Here are the couple of examples of expected pattern outputs.
Example 1:
Enter how many rows you want : 5
 1
 2 4
 1 3 5
 2 4 6 8
 1 3 5 7 9
Example 2:
1
2 4
1 3 5
2 4 6 8
1 3 5 7 9
2 4 6 8 10 12
1 3 5 7 9 11 13
2 4 6 8 10 12 14 16
1 3 5 7 9 11 13 15 17
2 4 6 8 10 12 14 16 18 20
Odd Even Number Pattern Program Logic:
From the above examples, We can see the first row of the pattern have Odd values(i.e 1) and second row of the pattern have even values (i.e 2 4), Similarly 3rd row have Odd values ( i.e 1 3 5 ), so on.
So we need to print Odd values at Odd rows and Even values at Even Rows.
Each Odd row starts with 1 and goes to next odd value by adding 2 to it.
Similarly each Even Row starts with 2 and goes to next even value by adding 2 to it.
Here is the program logic
- We have two loops one is Outer for loop and second one is Inner for loop
- The outer for loop represents the rows, So it will start from 1 and goes till the ‘n’ ( The ‘n’ is number of rows)
- For each Iteration of outer loop, The inner loop will goes from 1 to ‘i’ ( Here ‘i’ is the outer loop iterator)
- Before printing the values, We check if the present row is even or Odd by using ( i % 2 == 0 )Â Â Logic. If the output is 0 means our present row is Even, Otherwise Odd row.
- Once we find the row type ( Here variable ‘k’ is rowtype) , If it is Odd row we will start with 1 and keep on adding value 2 to it. So we always get the odd number
- Similarly, If the Row type ( Here variable ‘k’) is Even, Then our printing starts from 2 and prints desired even numbers until we reach (j<=i)
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Odd Even Number Pattern Program:
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#include<stdio.h> int main() {     int i,j,k,n;      // Take input from the User     printf("Enter how many rows you want : ");     scanf("%d", &n);      // Iterate from 1 to n ( i.e Number of Rows)     for(i=1; i<=n; i++)     {         // We need to print Even Numbers on Even Rows         // Odd numbers on Odd Rows         // So check if the row is even or odd         // If even start with 2         // If odd start with 1         if( i%2 == 0)             k=2;         else             k=1;          // We have triangle shape so start form 1 go till 'i'         // Now at each print increase the value by 2         for(j=1; j<=i; j++)         {             printf(" %d", k);             k+=2;        // k=k+2         }         printf("\n");     }     return 0; } |
Program Output:
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