Program to print the given number pattern
555555555
544444445
543333345
543222345
543212345
543222345
543333345
544444445
555555555
C Programming Language / Loop control in C Language
7636Program:
/** * C program to print number pattern */ #include <stdio.h> int main() { int N, i, j; printf("Enter N: "); scanf("%d", &N); // First upper half of the pattern for(i=N; i>=1; i--) { // First inner part of upper half for(j=N; j>i; j--) { printf("%d", j); } // Second inner part of upper half for(j=1; j<=(i*2-1); j++) { printf("%d", i); } // Third inner part of upper half for(j=i+1; j<=N; j++) { printf("%d", j); } printf("\n"); } // Second lower half of the pattern for(i=1; i<N; i++) { // First inner part of lower half for(j=N; j>i; j--) { printf("%d", j); } // Second inner part of lower half for(j=1; j<=(i*2-1); j++) { printf("%d", i+1); } // Third inner part of lower half for(j=i+1; j<=N; j++) { printf("%d", j); } printf("\n"); } return 0; }
Output:
Enter N: 5 555555555 544444445 543333345 543222345 543212345 543222345 543333345 544444445 555555555
Explanation:
Required knowledge
Basic C programming, Loop
Logic to print the given number pattern
Before you get into this confusing but interesting number pattern I recommend you to get yourself acquainted with the basics of number printing, learn the basic logic to print number pattern.
555555555 544444445 543333345 543222345 543212345 543222345 543333345 544444445 555555555
Once you get acquainted with basics of number pattern printing, have a careful eye on to above pattern. Let me help you, to make things easier lets divide this entire pattern into two big parts and six smaller pieces. The first upper half contains three parts
--------- 5-------- 54------- 543------ 5432----- --------- --------- --------- ---------
555555555 -4444444- --33333-- ---222--- ----1---- --------- --------- --------- ---------
--------- --------5 -------45 ------345 -----2345 --------- --------- --------- ---------
And the lower half of the pattern also contains three separate parts.
--------- --------- --------- --------- --------- 5432----- 543------ 54------- 5--------
--------- --------- --------- --------- --------- ----2---- ---333--- --44444-- -5555555-
--------- --------- --------- --------- --------- -----2345 ------345 -------45 --------5
Now, both upper and lower half's of the pattern would be printed separately in two separate outer loops. Considering the first upper half of the pattern. The logic to print upper half of the pattern:
- To iterate through rows, initialize a loop from N till 1. (Note: We can also use loop from 1 to&
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