In this article, we are going to **write a c program to find factorial of a number**.

We will make this program in the following way -:

- C Program To Find Factorial of a Number Using For Loop
- C Program To Find Factorial of a Number Using While Loop
- C Program To Find Factorial of a Number Using Do While Loop

To make this program, we will use the following concept given below.

If you do not know about these topics well, then you may not understand this program, so you should know about them in detail from the link given above.

Now without wasting time let’s start programming.

Page Contents

## C Program To Find Factorial of a Number Using For Loop

### Algorithm

- Program Start
- Declare Variables
- Input a number from the user
- Assign Value in the variable
- Loop start to find factorial
- Display factorial of a number
- Program End

### Program

```
//C Program To Find Factorial of a Number Using For Loop
#include<stdio.h>
void main()
{
int i,fact=1,n;
printf("Enter a number: ");
scanf("%d",&n);
for(i=1;i<=n;i++)
fact=fact*i;
printf("Factorial of %d is: %d",n,fact);
}
```

### Output

```
Enter a number: 3
Factorial of 3 is: 6
```

## C Program To Find Factorial of a Number Using While Loop

### Program

```
//C Program To Find Factorial of a Number Using While Loop
#include<stdio.h>
void main()
{
int i=1 ,fact=1,n;
printf("Enter a number: ");
scanf("%d",&n);
while(i<=n)
{
fact=fact*i;
i++;
}
printf("Factorial of %d is: %d",n,fact);
}
```

### Output

```
Enter a number: 5
Factorial of 5 is: 120
```

## C Program To Find The Factorial of a Number Using Do While Loop

### Program

```
//C Program To Find Factorial of a Number Using Do While Loop
#include<stdio.h>
void main()
{
int i=1 ,fact=1,n;
printf("Enter a number: ");
scanf("%d",&n);
do
{
fact=fact*i;
i++;
} while(i<=n);
printf("Factorial of %d is: %d",n,fact);
}
```

### Output

```
Enter a number: 10
Factorial of 10 is: 3628800
```

## Conclusion

So friends, in this article, we have written **a c program to find factorial of a number **in this ways -:

- C Program To Find Factorial of a Number Using For Loop
- C Program To Find Factorial of a Number Using While Loop
- C Program To Find Factorial of a Number Using Do While Loop

If you have difficulty to understand any program or have any doubts or questions, then tell me in the comment below.