C compilation errors

Question

I have to write a program in C which calculates and displays the following expression:

P=1*2*(1/3)*4*5*(1/6)

I tried running this code ( this is the whole code) but I cant compile it because it shows errors in the fourth and eleventh row in C++..What am I doing wrong?

   #include <stdio.h>

    int i,n,f=1;
    for(i=1;i<=n;i++)
    {
        if(i%3==0)
           f=f/i;
        else
           f=f*i;
    }
    printf("%d\n", f);
    return 0;

I cant write here the erros because they are soooo many..

now it shows : parameter f is initialized,syntax error before "for" — user2310758, Apr 23 '13 at 11:03
[Please](http://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list). — R. Martinho Fernandes, Apr 23 '13 at 11:04

score 4 · Answer 1 · answered Apr 23 '13 at 11:03

4

You are missing a definition of the main() function. Also, n is uninitialized; you need to assign it a value.

#include <stdio.h>

int main(void)
{
    int i,n,f=1;
    for(i=1;i<=n;i++)
    {
        if(i%3==0)
            f=f/i;
        else
            f=f*i;
    }
    printf("%d\n", f);
    return 0;
}

answered Apr 23 '13 at 11:03

Graham Borland

60,055
21
138
179

n is uninitialized.:) – Jeyaram Apr 23 '13 at 11:04
Well, that is also true. :) – Graham Borland Apr 23 '13 at 11:05
+1 for using a semicolon properly and not abusing commas instead. – Lightness Races in Orbit Apr 23 '13 at 11:05
This doesnt work.I think that I may have logical errors.. – user2310758 Apr 23 '13 at 11:07
Yes, start by making sure `n` has a sensible value. – Graham Borland Apr 23 '13 at 11:10
But I have already done that? – user2310758 Apr 23 '13 at 11:12
Well, you must have other errors, then. Update your question with your latest code, and tell us what the latest errors are. – Graham Borland Apr 23 '13 at 11:17
No, no, no. Stack Overflow is not a crowd-sourced debugger. – R. Martinho Fernandes Apr 23 '13 at 11:28
@user2310758 get a good book and start reading it. You won't learn programming by typing random stuff on a file and then running to ask others to fix it. – R. Martinho Fernandes Apr 23 '13 at 11:30
What is the best c programming language book out there in your opinion so I can buy it? I really want to learn man. – user2310758 Apr 23 '13 at 11:33

score 0 · Accepted Answer · answered Apr 23 '13 at 11:14

0

You may need to declare f as float, I am not getting any error in the following:

#include <stdio.h>

int main(void)
{
    int i,n;
    float f = 1;
    printf("Enter value of n:");
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        if(i%3==0)
            f=f/i;
        else
            f=f*i;
    }
    printf("%f\n", f);
    return 0;
}

answered Apr 23 '13 at 11:14

Dipto

2,720
2
22
42

The value of n has to be given by the user! – user2310758 Apr 23 '13 at 11:17
Ok, you can take it using `scanf`. that's not a big deal. – Dipto Apr 23 '13 at 11:18
There is some error in your code.For every n that i put i get 138.27 – user2310758 Apr 23 '13 at 11:21
copy it correctly. its giving different value for different input. 138.27 is for 10. – Dipto Apr 23 '13 at 11:23

C compilation errors

2 Answers2