C language

Question

I want to calculate the combination and permutation of tow numbers
But it doesn’t work
Do you know what is it’s problem?!
https://code.sololearn.com/c07gKmCHL8Wb/?ref=app

Answer 1

Laya Mousavi
Give the values to a=1,b=1,d=1.
And run it...

Answer 2

you are using [int e=n-r;]
before n and r are assigned any value. move [int e=n-r;] below [scanf]
for r and n to be initialized.

Answer 3

bahha🐧 i did that but it doesn’t work again😭

Answer 4

For global a,b,d give values fisrt.
You are multiplying so give 1 value to them.
a=1,b=1,d=1;

Answer 5

the problem is that the a, b, d at the end of the loop they equal 0

Answer 6

#include <stdio.h>
int f1(int a,int d);
int f2(int a,int b, int d);
int a,b,d;
int main() {
int n,r,c,p;
scanf("%d%d",&n,&r);
int e=n-r;
for(;n>1;n--)
a*=n;
for(;r>1;r--)
b*=r;
for(;e>1;e--)
d*=e;
printf("a = %d b = %d c = %d",a, b, d);

return 0;
}

Answer 7

bahha🐧 would you check it again?!i wrot the loop works till n==1
why it becomes 0?!

Answer 8

Jayakrishna i don’t know what you mean would you do it your self?!please

Answer 9

int a=1;
int b = 1;
int d = 1;
don't forget to change n==1 to n>1

Answer 10

Laya Mousavi
Give the values to a=1,b=1,d=1.
And run it...

And why you changed for loop conditions.. Its e>1, and next also ..
Its output if i give 5,3
output: 60 10.
is it ok...

Answer 11

bahha🐧 Jayakrishna thanks both of you so much
it runs at last
but i have a new problem with my last question,if you could help me i became thanksfull

Answer 12

😂

Answer 13

write a c program to creat folder?