C Language Examples - Creating Various Triangle Patterns
Creating triangle patterns.
Example - Using Asterisks
#include <stdio.h>
int main()
{
int i, j, rows;
printf("Number of rows: ");
scanf("%d", &rows);
for (i = 1; i <= rows; ++i)
{
for (j = 1; j <= i; ++j)
{
printf("* ");
}
printf("\n");
}
return 0;
}
*
* *
* * *
* * * *
* * * * *
Example - Using Numbers
#include <stdio.h>
int main()
{
int i, j, rows;
printf("Number of rows: ");
scanf("%d", &rows);
for (i = 1; i <= rows; ++i)
{
for (j = 1; j <= i; ++j)
{
printf("%d ", j);
}
printf("\n");
}
return 0;
}
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
Example - Using Letters
#include <stdio.h>
int main()
{
int i, j;
char input, alphabet = 'A';
printf("Enter an uppercase letter: ");
scanf("%c", &input);
for (i = 1; i <= (input - 'A' + 1); ++i)
{
for (j = 1; j <= i; ++j)
{
printf("%c", alphabet);
}
++alphabet;
printf("\n");
}
return 0;
}
A
B B
C C C
D D D D
E E E E E
Example - Inverted Triangle
#include <stdio.h>
int main()
{
int i, j, rows;
printf("Number of rows: ");
scanf("%d", &rows);
for (i = rows; i >= 1; --i)
{
for (j = 1; j <= i; ++j)
{
printf("* ");
}
printf("\n");
}
return 0;
}
* * * * *
* * * *
* * *
* *
*
Example - Inverted Triangle with Numbers
#include <stdio.h>
int main()
{
int i, j, rows;
printf("Number of rows: ");
scanf("%d", &rows);
for (i = rows; i >= 1; --i)
{
for (j = 1; j <= i; ++j)
{
printf("%d ", j);
}
printf("\n");
}
return 0;
}
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1
Example - Pyramid
#include <stdio.h>
int main()
{
int i, space, rows, k = 0;
printf("Enter the 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;
}
*
* * *
* * * * *
* * * * * * *
* * * * * * * * *
Example - Number Pyramid
#include <stdio.h>
int main()
{
int i, space, rows, k = 0, count = 0, count1 = 0;
printf("Number of rows: ");
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;
}
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
Example - Inverted Pyramid
#include <stdio.h>
int main()
{
int rows, i, j, space;
printf("Number of rows: ");
scanf("%d", &rows);
for (i = rows; i >= 1; --i)
{
for (space = 0; space < rows - i; ++space)
printf(" ");
for (j = i; j <= 2 * i - 1; ++j)
printf("* ");
for (j = 0; j < i - 1; ++j)
printf("* ");
printf("\n");
}
return 0;
}
* * * * * * * * *
* * * * * * *
* * * * *
* * *
*
Example - Pascal's Triangle
#include <stdio.h>
int main()
{
int rows, coef = 1, space, i, j;
printf("Number of rows: ");
scanf("%d", &rows);
for (i = 0; i < rows; i++)
{
for (space = 1; space <= rows - i; space++)
printf(" ");
for (j = 0; j <= i; j++)
{
if (j == 0 || i == 0)
coef = 1;
else
coef = coef * (i - j + 1) / j;
printf("%4d", coef);
}
printf("\n");
}
return 0;
}
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
Example - Floyd's Triangle
#include <stdio.h>
#define N 10
int main()
{
int i, j, l;
for (i = 1, j = 1; i <= N; i++)
{
for (l = 1; l <= i; l++, j++)
printf("%5d", j);
printf("\n");
}
return 0;
}
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