Thread: don't have any clue how to do this

if you can help me. i'd appreciate it.

the point of the assignment is to learn scanf. please help me with what i'm trying to do. stop making me feel pathetic.=(

exactly like that....only it doesnt compile

This is yours

Code:

#include <stdio.h>
#include <math.h>

main()
{
double i, p, n, a;
printf("Enter the amount of the loan->");
scanf("%lf\n", &p);
printf("Enter the interest rate ->");
scanf("lf\n", &i);
printf("Enter the term (in years) ->");
scanf("%lf\n",&n);
n *= 12;
a = p*(i*pow(1+i, n))/ (pow(1+i, n) -1);
printf("Your monthly payment is--->%lf", a);
}

This is mine

Code:

#include <stdio.h>
#include <math.h>


int main(void)

{

    double p, x, y, a;
    float r;
    int n;
    printf("Enter the amount of the loan ->");

    scanf("%lf", &a);

    printf("Enter the interest rate ------>");

    scanf("%f", &r);

    r=r/1200;

    printf("Enter the term (in years) ---->");

    scanf("%i\n",&n);

    n = n / 12 ;

    p = a * (r * (pow ((double) r+1 , (double) n)) ) / ( (pow ((double)
1+r , ((double) n))-1 ) );

    printf("your monthly payment is :%f\n", p);

    return 0;

}

oh. sry. i added \n but only because i was trying to make your code work.

i can't actually copy paste because of the text editor i'm running is in linux. i'm using putty. what are you talking about about printf? is something wrong?

i tried your code exactly as yours is... it didn't work...

my code is what i had already before you gave me your code. it doesn't work either.

I'm going to repost what Dave posted. He posted enough of his program such that all you have to do is wrap it around main(void) and provide a correct printf() call.

Code:

#include <stdio.h>

int main ( void )
{
   /* Define some variables.*/
   double i, p, n, a;

   /* Get input */   
   printf("Enter the amount of the loan ->");
   scanf("%lf", &p);
   printf("Enter the interest rate ------>");
   scanf("%lf", &i );
   printf("Enter the term (in years) ---->");
   scanf("%lf", &n );

   /* Apply formula to values */
   n *= 12;
   a = p * (i * pow(1 + i, n)) / (pow(1 + i, n) - 1);

   /* View output. */
   printf("your monthly payment is :%g\n", a);
   return 0;
}

I've marked differences between your code and Dave's. You be careful about saying who's wrong around here - arguments with the mods will only work when you are right. And do your work. There's an incredible amount of spoonfeeding and a lack of effort on your part.

It works for me:
$ ./a
Enter the amount of the loan ->1000
Enter the interest rate ------>1.8
Enter the term (in years) ---->2
your monthly payment is :1800

i new the %lf was different, i said so. i missed the %g i'm gonna go try it again.

i appreciate you being so explicit. but i resent your analogy between me and a baby. Everybody's gotta start somewhere and

"%lf is undefined for printf until C99 (where it is ignored)."

makes no sense to me. it's a worthless sentence to my 2 week old programming ears. also, do NOT say i didn't do any work. i posted my code above. it's a basic code and maybe YOU wouldn't have to do any work to arrive at it... but i have spent 2 sleepless nights on it trying to make it work. also, i'm getting frustrated because 2 different people told me not to use scanf since i'm not familiar with it... IT'S A HOMEWORK ASSIGNMENT, THATS THE POINT. lastly, i've only had about 4.5 hours of sleep in the last two days and i have a test in history and c tomarrow... i'll be irritable until wednesday, sorry.