Thread: if else problem

ok can you explain what a prototype is in simple terms for me plz.

Look at this code...

If you actually try to call (i.e. use) a function before that function i defined, the compiler won't know if it's being called properly (i.e. that the right number and types of parameters are being passed and/or returned).

In order to let the compiler know what to expect, you simply add the function name with it's parameter types and return type (if any). So for a function called swap, which takes two pointers to integers, but returns nothing, you should add the line

void swap( int *, int * );

at some point after your #include's, and before main.

am i able to use scanf to read characters from input and then only print certain things back to output? How do i specify what i want it to print back out. For example if i only want it to print everything except an A or something? At this stage i only know how to scanf in one letter at a time and print the same letter back out again:

Code:

#include <stdio.h>

           
   int main()
           
   {
   
      char a;
   
      scanf("%c", &a);
   
      printf("%c\n", a);
   
   }

this isnt working but am i on the right track with this?

Code:

#include <stdio.h>

           
   int main()
           
   {
   
      char a[200];
      while(a != '/0'){
         scanf("%c", &a);
      }
      if(a != 'l' || a != 'L'){
         printf("%c\n", a);
      }
   
   }

Best go to google.com and put scanf (or better) fgets into the search engine. You'll get everything you need from there.

It's always worth doing a quick search there before placing questions to the forum.

Ok i see how i use the gets, but how do i specify what i want it NOT to print out. Is it like what i did in the code in my last post or how so i do it. If you could point me to a tute that explains that.. cool, otherwise an example would be nice.

Heres the gets

Code:

#include <stdio.h>

           
   int main()
           
   {
      char my_string[500];
   
      gets(my_string);
   
      printf ("You typed: %s\n", my_string);
   
      return 0;
   }

how come my or doesnt work?

Code:

#include <stdio.h>

   int len;

   int i;
           
   int main()
           
   {
      char my_string[500];
   
      gets(my_string);
   
   
      len = strlen(my_string);
   
      for (i = 0; i < len; i++)
      {
         if (my_string[i] != 'L' || my_string[i] != 'l') putchar(my_string[i]);
      }
   
      return 0;
   }

I have had a look at what the FAQ has to say about strcmp() but i still dont really know how i use it, or even if its what i need to use. I need to be able to look at whole words and not just letters as i have got above. Can someone please show me an example of this.

i tried this:

Code:

if (my_string[i] != 'something') putchar(my_string[i]);

but it wont work coz it only looks at individual characters.