Thread: Very simple codes in C,Need help!!

Well, we don't usually do people's homework for them...
Read this --> C Board - Announcements in Forum : General Programming Boards

However, if you get to work on your code and run into trouble, you can post the code here and I'm sure some of us will help out.

(Hint: Look in your C library documentation at scanf() )

Originally Posted by CommonTater

Well, we don't usually do people's homework for them...
Read this --> C Board - Announcements in Forum : General Programming Boards

However, if you get to work on your code and run into trouble, you can post the code here and I'm sure some of us will help out.

(Hint: Look in your C library documentation at scanf() )

Its not you doing my homework,it is just I couldnt understand the thing with the EOF,I couldnt understand whats is the value of scanf when the input if illegal,dude I like searched the net for this,,,!

Thank you

Well, like search the documentation for your compiler's libraries...

scanf - Wikipedia, the free encyclopedia <--- first return after search for "scanf()" on Google.

And don't ever refer to me as "Dude"...

Originally Posted by CommonTater

Well, like search the documentation for your compiler's libraries...

scanf - Wikipedia, the free encyclopedia <--- first return after search for "scanf()" on Google.

And don't ever refer to me as "Dude"...

first of all thank you,

Second off,I am sorry for referring to you with the word "dude" but its just i thought it was a good word in english ,,,

Originally Posted by Kadmany

first of all thank you,

I trust my non-answers were satisfactory ... actually the skill for looking stuf up is a pretty important part of the trade, so it's important you learn how to do it early on.

Second off,I am sorry for referring to you with the word "dude" but its just i thought it was a good word in english ,,,

It has different meanings on a regional basis... Some areas everyone is "Dude"... some areas it's a friendship thing "He's my Dude!"... where I am it's like calling someone an a-hole, quite the insult really. (One of the problems you run into on international sites like these)

Hmm I read scanf() in wiki,but I still cant understand how to solve this,my only problem is to know how I could make scanf() recieve as input numbers with spaces between them and then stop at 22

The general idea might look like this kind of logic: (this is not code)

Code:

do {
  print "enter a number or 22 when input is complete"
  scanf("your format", &yourNumber)
}while(yourNumber does not equal twenty-two);

Originally Posted by Kadmany

Hmm I read scanf() in wiki,but I still cant understand how to solve this,my only problem is to know how I could make scanf() recieve as input numbers with spaces between them and then stop at 22

Ok... looking at your original problem, I would not attempt to get all those inputs on one line... In fact from a practical standpoint it would be rather foolish to try.

First; unless you are certain you will always get the same number of entries, scanf() is useless to you.

Second; trying to read the group as a string using fgets() will work, but parsing the numerical values out of the string is some pretty advanced coding. Even for some of the more advanced programmers here, this is some pretty complex stuff.

Third; since I take it you are pretty new at this, in your place I would be prone to question the assignment suggesting that inputs on multiple lines make more sense.

Adak has given you a suggestion for how to handle this with a loop, and I think it's the best way to do it.

1. scanf returns the number of items successfully scanned.
int count;
count = scanf("%d",&val);
if (count == 1) ...succeed
if (count == 0) ...fail

2. scanf for 1 item at a time will work with multiple items on a line. each call to scanf("%d",&val) will eat only the next number and the rest will still be there waiting for the next scanf. when it gets to the end of a line it will wait patiently for you to enter the next line and it will wake up and continue looking for the next number (or illegal string)

Hello,

First of all,thank you all very much for helping me,Before I continue I want to stress that
I didn't just throw a "Homework" on the net just because I am bored to do it ,as you all see it is not that clear how scanf() works,what value it returns,and of-course the EOF,

so,to get this clear ;

when I do a regular scanf(),(one command),for one string input ( without space) I will get a normal one input

for two strings with space in between them, scanf() will only get first string?

for 3 ,,,, n ,,,,, etc only first ?

when I combine between while and scanf() ,as ;

Code:

while(grade!=EOF){

EOF=scanf("%d",grade);

sum+=grade;

}

? is it correct

it is just not that clear see these inputs :

23 65 97 101
231 45 101
e 43 88 100 101
t 343 23
101
101
what will happen then ? How am I supposed to handle these errors ?

Thank you all in advance!

Code:

#include <stdio.h>
#define STOP_INPUT 101

int cnt=0,check,scanf_result;
double min=0,max=0,average=0,sum=0,grade;

int main(){

  printf("Please enter the grades : ");

  while(grade!=STOP_INPUT){

      scanf_result=scanf("%lf", &grade);//We get inout from user and save what scanf itself return (if there is error ,,, )

      if(scanf_result<1){

          printf("\nYou entered ilegall value,all values must be numbers\n");
          //No need to check if its in range 0 - 100,because its given that numbers are only in range 0 - 100!
          return 1;
      }

      if(grade!=STOP_INPUT){

          sum+=grade;

          if(grade>max){

              max=grade;

          }

          if(cnt==0){

            min=max;

          }

          if(grade<min){

              min=grade;
          }

      cnt++;

      }
      else{//We check if grade=101

          if(cnt==0){//We check if cnt still equals 0,so it means this grade is the first which means user didnt enter any real grade!

              printf("\nYou didn't enter any grade!");
          }
      }

   }

  if(cnt!=0){

  average=sum/(double)(cnt);



     check=average-average/10;//the methos average%10 DIDN'T work,it gave me error of operands! dont know whats this,so I used this.
    if(check==0){

       printf("\nYour average is : %d \n", (int)(average));

      }
      else{

        printf("\nYour average is : %.2lf  \n", average);

       }

  printf("Your Heighst grade is : %lf  \n", max);
  printf("Your Lowest grade is : %lf \n", min);

  }

  printf("\n");
  return 0;
}