Difficulties to do diamond pattern in C program

July 6, 2021

1 Floyd’s Triangle.

include

int main() {
int rows, i, j, number = 1;
printf(“Enter the number of rows: “);
scanf(“%d”, &rows);
for (i = 1; i <= rows; i++) {
for (j = 1; j <= i; ++j) {
printf(“%d “, number);
++number;
}
printf(“\n”);
}
return 0;
}

output

1
2 3
4 5 6
7 8 9 10

2 Pascal’s Triangle

include

int main() {
int rows, coef = 1, space, i, j;
printf(“Enter the 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;
}
output

``````      1
1   1
1   2   1
1   3   3    1``````

1 4 6 4 1
1 5 10 10 5 1

3 Inverted full pyramid of *

include

int main() {
int rows, i, j, space;
printf(“Enter the 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;
}

output

``````* * * * *
* * *
*``````

4 Full Pyramid of Numbers

include

int main() {
int i, space, rows, k = 0, count = 0, count1 = 0;
printf(“Enter the 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;
}

output

``````    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

5 Full Pyramid of *

include

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;
}

output

``````    *
* * *
* * * * *``````

6 Inverted half pyramid of numbers

include

int main() {
int i, j, rows;
printf(“Enter the 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;
}

output

1 2 3 4 5
1 2 3 4
1 2 3
1 2
1

6 Inverted half pyramid of numbers

include

int main() {
int i, j, rows;
printf(“Enter the number of rows: “);
scanf(“%d”, &rows);
for (i = rows; i >= 1; –i) {
for (j = 1; j <= i; ++j) {
printf(“* “);
}
printf(“\n”);
}
return 0;
}

output

• *
* 7 Half Pyramid of Alphabets

include

int main() {
int i, j;
char input, alphabet = ‘A’;
printf(“Enter an uppercase character you want to print in the last row: “);
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;
}

output

A
B B
C C C
D D D D
E E E E E

8 Half Pyramid of Numbers

include

int main() {
int i, j, rows;
printf(“Enter the 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;
}

output

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

9 Half Pyramid of *

include

int main() {
int i, j, rows;
printf(“Enter the number of rows: “);
scanf(“%d”, &rows);
for (i = 1; i <= rows; ++i) {
for (j = 1; j <= i; ++j) {
printf(“* “);
}
printf(“\n”);
}
return 0;
}

output

*

• *