Need help on C programming

Hi guys, is there anyway to have a program where it ask for three numbers and you shows which which number is the largest and which is the smallest, e.g.

Enter 1st number: 30
Enter 2nd number: 10
Enter 3rd number: 30
Largest = 30
Smallest = 10

Much help appreciated.

I'd imagine anything is possible with a bit of effort.

Code:

---

#include <stdio.h>

int main(void)
{
  // declare variables
  // show prompt(s)
  // receive and validate input
  // compare input and assign output
  // show output

  return 0;
}

---

Give it a try and post your code if you get stuck.

I already have a working code, but it does not look aesthetic due to using too many if() and else if(), I am learning it by myself and right now I am reading on swap() which I think it can be used to determine the largest and smallest numbers, but I can't get it to work

What are you swapping? Have a largest variable and a smallest variable, no swapping involved.

I was reading another thread; http://cboard.cprogramming.com/c-pro...-integers.html, and there is a guy suggested using swap() so I look it up on the book, anyway because I used too many if() to determine which number is largest and which is smallest, I am asking if there is a way to determine the largest and smallest integer entered?

//Enter one number , make it equal to largest and smallest variable;
//Enter second number (if second number bigger than largest, then make largest=second number...(same for smallest) if second less than smallest...
//Repeat for 3rd number

I found this code

Code:

---

#include<stdio.h>
#include<conio.h>
void main()
{
int n,big,sml,i,totalNumber;
clrscr();
printf("\n How many number you will enter : ");
scanf("%d",&totalNumber);
for (i=0;i<totalNumber;i++)
{
printf("\n Enter number %d : ",i+1);
scanf("%d",&n);
if(i==0)
{
big=sml=n;
}
if(big<n) big=n;
if(sml>n) sml=n;
}
printf("\nBiggest number of all : %d",big);
printf("\nSmallest number of all : %d",sml);
getch();}


---

but cant get it to work in my program

What do you mean by "cant get it to work in my program"?

if you're getting compiler errors with that code, get rid of the non-standard parts #include<conio.h>, clrscr(), and getch(). Get rid of void main regardless.

Code:

---

float three_numbers(float num1, float num2, float num3){
        printf("Sum = %.0f\n", num1+num2+num3);
    printf("Average = %.2f\n", (num1+num2+num3)/3);
        printf("Product = %.0f\n",num1*num2*num3);
}
void a2question2()
{
int n,big,sml,i;
for (i=0;i<totalNumber;i++)
{
printf("Enter three whole number: \n",i+1);
scanf("%d",&n);


if(i==0)
{
big=sml=n;
}
if(big<n) big=n;
if(sml>n) sml=n;
}
printf("\nBiggest number of all : %d",big);
printf("\nSmallest number of all : %d",sml);
                       
}

---

this is part of my program. Its printing something like this:
Enter three whole number: 3
Enter three whole number: 4
Enter three whole number: 5
is there anyway i can ask it to say,
Enter 1st number: 3
Enter 2nd number:4
Enter 3rd number: 5
and how can I transfer this 3 numbers into my three_numbers() ?

you can pass them in as parameters.

Code:

---

void a2question2(float *n1, float *n2, float *n3)
{
  int i;

  for(i=1; i <= 3; ++i)
  {
      printf("Enter %d%s", i, i == 1 ? "st", i == 2 ? "nd" : "rd");
      scanf("%f", i == 1 ? n1 : i == 2 ? n2 : n3);
  }

  ... // other bits of code
}

---

Code:

---

float three_numbers(float num1, float num2, float num3){

    printf("Sum = %.0f\n", num1+num2+num3);
    printf("Average = %.2f\n", (num1+num2+num3)/3);
    printf("Product = %.0f\n",num1*num2*num3);

    // should be returning a float
}

---

in main call it

Code:

---

float num1, num2, num3;

a2question2(&num1, &num2, &num3);
float_result = three_numbers(num1, num2, num3);
// function returns a float, but what value are you returning?

---

Code:

---

voida2question2(float*n1, float*n2, float*n3){
  int i;

  for(i=1; i <= 3; ++i)
  {
      printf("Enter %d%s", i, i == 1 ? "st", i == 2 ? "nd" : "rd");
      scanf("%f", i == 1 ? n1 : i == 2 ? n2 : n3);
  }

  ... // other bits of code

}

---

this isn't working for me, can you just show me the fundamentals of what you just did instead of pasting the code? I will try to continue from there

I declared three variables in main and passed them by reference to a2question2 so that they could be modified within that function via scanf; I used the ? operator like an if/else if/else or switch of the loop.

Code:

---

if(i == 1)
  scanf("%f", n1);
else if(i == 2)
  scanf("%f", n2);
else
  scanf("%f", n3);

---

What isn't working for you?