Having some issues with this assigment, please help. - The assignment is to crea

Question

Having some issues with this assigment, please help.

- The assignment is to create a program to display the number of combinations where n and k are entered by the user.

  Input 1.

a)      Ask for n. Check for bounds (1 <= n && n <= 10).

i)       If the user entered an integer within (1 and 10), move on to getting the value for k

ii)      Else keep asking the user till they give a correct value which is an integer within 1 and 10.

iii)     Reject any input greater than 10 or less than 1 by displaying an error message and then asking the user to re-enter the input. Do this as many times that they enter incorrect input.

  Input 2.

  Ask for k. Check for bounds (1 <= k && k <= n).

If the user entered an integer within (1 and k), move on to next step.

Else keep asking the user till they give a correct value which is an integer within 1 and n.

Reject any input greater than n or less than 1 by displaying an error message and then asking the user to re-enter the input. Do this as many times that they enter incorrect input.

Calculate n

Explanation / Answer

#include<stdio.h>

int factorial(int num){
if(num ==0 || num == 1){
return 1;
}

int fact = 1;

while(num > 1){
fact *= num;
num--;
}
return fact;
}

int main(){
int n,k;
int flag = 0;
while(!flag){
printf("Enter the value of n : ");
scanf("%d",&n);

if(n >= 1 && n <= 10){
flag = 1;
break;
}else{
printf("Value of n should be between 1 and 10 . Please try again with anothere value. ");
}
}
flag = 0;
while(!flag){
printf("Enter the value of k : ");
scanf("%d",&k);
if(k >= 1 && k <= n){
flag = 1;
break;
}else{
printf("Value of k should be between 1 and %d.Please try again with anothere value. ",n);
}
}

int factn = factorial(n);
int factk = factorial(k);
int factnk = factorial(n-k);

int res = factn/(factk * factnk);

printf("The number of combinations of %d things taken %d at a time is %d ",n,k,res);

return 0;
}

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