**Calculating Factorial using c language**

`//WAP to calculate factorial of a number`

#include<stdio.h>

void main()

{

int n,s=1,i=1;

printf("Enter a number to calculate upto");

scanf("%d",&n);

while(i<=n)

{

s=s*i;

i++;

}

printf("Factorial of %d is %d",n,s);

}

**Calculating Summation using c language**

#include<stdio.h>

void main()

{

int n,i,s=0;

printf("calculate summation upto");

scanf("%d",&n);

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

{

s = s+i;

}

printf("your result is%d",s);

}

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