Pattern programs in C ?

  • Pattern programs in C print various patterns of numbers and stars. These codes explain how to create various patterns using C programming. The C programs involve usage of nested for loops (a for loop inside a for loop).
  • A pattern of numbers, star or characters is a way of arranging these in some logical manner or they may form a sequence. Some of these patterns are triangles which have special importance in mathematics.

Example 1

Sample Code in C:

#include <stdio.h>
int main()
{
int i, space, rows, k=0;

printf("Enter number of rows: ");
scanf("%d",&rows);

for(i=1; i<=rows; ++i, k=0)
{
for(space=1; space<=rows-i; ++space)
{
printf(" ");
}

while(k != 2*i-1)
{
printf("* ");
++k;
}

printf("\n");
}

return 0;
}

Output

    Enter number of rows : 5
        *
* * *
* * * * *
* * * * * * *
* * * * * * * * *

Example 2

Sample Code in C:

#include <stdio.h>
int main()
{
int i, space, rows, k=0, count = 0, count1 = 0;

printf("Enter number of rows: \n");
scanf("%d",&rows);

for(i=1; i<=rows; ++i)
{
for(space=1; space <= rows-i; ++space)
{
printf(" ");
++count;
}

while(k != 2*i-1)
{
if (count <= rows-1)
{
printf("%d ", i+k);
++count;
}
else
{
++count1;
printf("%d ", (i+k-2*count1));
}
++k;
}
count1 = count = k = 0;

printf("\n");
}
return 0;
}

Output

    Enter number of rows : 5
         1 
2 3 2
3 4 5 4 3
4 5 6 7 6 5 4
5 6 7 8 9 8 7 6 5

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