How do you program the following in c?

Question

1. how do you write a program in c to find the factorial of a number.

2. how do write in c to add matrixes using pointers

hi you guys hope am not disturbing you, just that i can't do this on my own thanks alot

Answer 1

1.this is for the first answer

#include<stdio.h>

#include<conio.h>

main()

{

int a=0,fac=1,i;

printf("enter a number");

scanf("%d",&a);

if(a==0)

printf("%d",fact);

else

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

{

fact=fact*i;

}

printf("%d",fact);

getch();

}

2.this is for the second answer

#include <conio.h>

#include<stdio.h>

int main()

{

int mat1[10][10],*p1, mat2[10][10], *p2, sum[10][10], *s;

int i,j, m,n;

p1=mat1;

p2=mat2;

s=sum;

printf("how many rows and coloumns?\n");

scanf("%d%d",&m,&n);

printf("enter matrix 1\n");

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

{

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

scanf("%d", p1+i*10+j);

}

printf("enter matrix 2\n");

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

{

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

scanf("%d", p2+i*10+j);

}

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

{

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

*(s+i*10+j)=*(p1+i*10+j) + *(p2+i*10+j);

printf("\n");

}

printf("Sum matrix\n");

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

{

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

printf("%d  ", *(s+i*10+j));

printf("\n");

}

getch();

}

Answer 2

void main()

{

int a,i;

long int fac=1;

printf("enter number");

scanf("%d",&a);

for(i=a;i<=1;i--)

{

fac=fac*i;

}

printf("factorial of %d is %ld",a,fac);

}

long int bcoz it will lead problem with int when find factorial after 9

good luck for another program

i m not sure abt that

sorry

Answer 3

1)

int no,fact=1;    \* Declaring the variables

cout<<"Enter no ";  \* displaying message for input

cin>>no;  

while(no>0)          \* using while loop

{

fact=fact*no;

no=no-1;

}

Answer 4

For the factorial part ...

try this ..

int factorial( int number)

{    if( number == 0)

       return 1;

     else

       return (number * factorial(number -1))

}

//  Use the above code for factorial and call using factorial(5) . It

// should return 120 .

About the adding matrices ,

Please note that all matrices( or arrays) ultimately decomposes to pointers .

Here is the logic , please try it yourself ..

1. Check for order to be same (most important , else no addition)

2. Run a loop inside a loop to traverse each matrix and add corresponding elements of two matrices and store them at a third matrix.

dont worry .. point 2 will be a bit difficult at first , but then .. rome wasnt built in a day. DONT copy paste code form intenet , try it and i am full ysure you will get it. Once you understand it , you will definitely begin to  love C. ...