Q. Write a C program to generate pascal triangle.

**OR**

Q. Write a C program to print following number triangle :

1 | ||||||||

1 | 1 | |||||||

1 | 2 | 1 | ||||||

1 | 3 | 3 | 1 | |||||

1 | 4 | 6 | 4 | 1 |

**Ans.**

**How to build Pascal triangle:**

### To build the pascal triangle, start with "1" at the top, then continue placing numbers below it in a triangular pattern. Each number is build just sum of above two number, (except for the edge, which are all ‘1’ and all numbers outside the Triangle are 0's). so

### 0 row = 1

### 1 row = adding the two numbers above them to the left and the right

### = (0+1) , (1+0)

### = 1 , 1

### 2 row = (0+1) , (1+1) , (1+0)

### = 1 , 2 , 1

### 3 row = (0+1), (1+2), (2+1), (1+0)

### = 1 , 3 , 3 , 1

### 4 row = (0+1), (1+3) , (3+3), (3+1), (1+0)

### = 1 , 4 , 6 , 4 , 1

/*c program for making pascal triangle*/

**#include**<stdio.h>

**#include**<conio.h>

long calc( int );

int main()

**{**

int i,j,row,pas;

printf("Enter no. of rows in pascal triangle : ");

scanf("%d",

**&**row);
for(i=0; i<row; i++)

{

for(j=0; j<=(row-i-1); j++)

printf(" ");

for(j=0; j<=i; j++)

{

pas=calc(i)/(calc(j)*calc(i-j));

printf("%ld ",pas); //take single space

}

printf("\n");

}

getch();

getch();

**return 0**;

**}**

long calc( int num)

{

int x;

long res=1;

for(x=1; x<=num; x++)

res=res*x;

**return**(res);

}

__Output__:-
simple way with out using function....

ReplyDelete#include

#include

void main()

{

int i,j,n,c,k,space;

clrscr();

printf("Enter the limit ");

scanf("%d",&n);

printf("\n\n");

space=n;

for(i=0;i<=n;i++)

{

c=1;

for(k=space;k>=0;k--)

printf(" ");

space--;

for(j=0;j<=i;j++)

{

printf("%d ",c);

c=(c*(i-j)/(j+1));

}

printf("\n");

}

getch();

}

good its so simple, thanks

DeleteExcellent ... and great effort... U proved u r a great programmer :)

Deleteit works good but if u enter the no of rows as 2,in the output three rows are printed i.e. if u enter the no rows as a,the output is printed with a+1 rows

Delete@Aravind Swamy,

DeleteI checked above program again and find that,

the output will be equal of the entered no of rows.

Try some different compiler.

thank u dinilps

Deletethis program is working

friend i want to algorith

Deletei think the comment is the best method to solve it.the given is quite logical bt the next is ultimate.

ReplyDeletethe above prog is good bt u hv to declare the pass as long else it give u garbage value...

ReplyDeleteSimpler Approach!

ReplyDelete#include

void main()

{

int i,j,x,n,s;

printf("Enter The Number : ");

scanf("%d",&n);

for(i=0;i<=n;i++)

{

x=1;

for(s=1;s<=n-i;s++)

printf("\t");

for(j=1;j<=i+1;j++)

{

printf("%d\t\t",x);

x=x*(i-j+1)/j;

}

printf("\n");

}

}

every thing is correct except that in:

Deleteline 11 : printf(" ");

line 14 : printf("%d ",x); //single space

change these things in the program and it will run

Right jai raj

Deleteits not printing the required output

ReplyDelete@artwel junior,

DeleteWrite down your code, for solving error.

Try some other differ compiler.

#include

ReplyDelete#include

void main()

{

int i,j,sp,num=1,r;

clrscr();

for(i=1;i<=5;i++)

{

r=num;

for(sp=i;sp<=5;sp++)

printf(" "); //2 space

for(j=1;j<=i;j++)

{

printf("%d ",r%10); //3 space

r=r/10;

}

num=num*11;

printf("\n");

}

getch();

}

not working in quincy ...

Deletecan i have a flow chart and algorithm for this?

ReplyDeleteThis comment has been removed by the author.

ReplyDeleteThis comment has been removed by a blog administrator.

ReplyDeletecan any one explain this logic for me

ReplyDeletegood

ReplyDeletesuperb....!

ReplyDelete#include

ReplyDelete#include

void main()

{

int i,j,n,c,k,space;

clrscr();

printf("Enter the limit ");

scanf("%d",&n);

printf("\n\n");

space=n;

for(i=0;i<=n;i++)

{

c=1;

for(k=space;k>=0;k--)

printf(" ");

space--;

for(j=0;j<=i;j++)

{

printf("%d ",c);

c=(c*(i-j)/(j+1));

}

printf("\n");

}

getch();

}

#include

ReplyDelete#include

void main()

{

int i,j,n,c,k,space;

clrscr();

printf("Enter the limit ");

scanf("%d",&n);

printf("\n\n");

space=n;

for(i=0;i<=n;i++)

{

c=1;

for(k=space;k>=0;k--)

printf(" ");

space--;

for(j=0;j<=i;j++)

{

printf("%d ",c);

c=(c*(i-j)/(j+1));

}

printf("\n");

}

getch();

}

#include

ReplyDelete#include

long calc( int );

int main()

{

int i,j,row,pas;

printf("Enter no. of rows in pascal triangle : ");

scanf("%d", &row);

for(i=0; i<row; i++)

{

for(j=0; j<=(row-i-1); j++)

printf(" ");

for(j=0; j<=i; j++)

{

pas=calc(i)/(calc(j)*calc(i-j));

printf("%ld ",pas); //take single space

}

printf("\n");

}

getch()

#include

ReplyDelete#include

#include

int fact(int a)

{

int b,fact=1;

for(b=1;b<=a;b++)

fact=fact*b;

return fact;

}

main()

{

int a,b,c,row,ele;

printf("Enter number of row you want to print:");

scanf("%d",&row);

for(a=0;a<=row;a++)

{

for(b=0;b<=(row-a+2);b++)

{

printf(" ");

}

for(c=0;c<=a;c++)

{

ele=fact(a)/(fact(c)*fact(a-c));

printf("%d ",ele);

}

printf("\n");

}

}

functiopn is best method for pascal triangle as it uses a concept of bionomial coeff

Delete