manipulating strings

i'm trying to manipulate a sting it think.

i have read a string with gets(input)

then i would like to determine what character is in say postion 5?

i thought this could be done by

puts(input[4]);

but i seem to be getting casting errors about pointer to int???

any tips on where i should go with this?

If you're printing just a character in a position, just use:

char *mystring = "Hello there. Some message goes here.";

printf("%c\n", mystring[4] );

Quzah.

so if i have to read it from the user can i:

char input[50];
char *mystring;

mystring = input;

gets(input);

puts(mystring[4]);

Use fgets() instead of gets. It is safer.

You could use: 'puts( input + 4 )'.

Quzah.

if i use input +4 it will print everything from position 4 and beyond. is it possible to restrict this to only position 4?

Yep. If you want to print a single character, you have to use CHARACTER functions instead of STRING functions.

puts = put string
putc = put a character. Your array[x] will work here too.

Quzah.

ok i think i'm getting a little over my head here.

all i want to do is read the a line of text.

i need to determine the first character and place it in its own variable. then i have to determine if the next character is either a space or return. if it is a return i continue with the program. if it is a space i read the rest of the characters and store them in a string.

i think i was off track with my logic earlier.

Use fgets() to read from the standard input device (called 'stdin', which basicly means your keyboard), and store it in a buffer (an array).

Next, check the first character:

if( buffer[0] == whatever ) variable = buffer[0];

Next, check the following character and do whatever.

if( buffer[1] == ' ' ) ...it's a space, do whatever...
else if ( buffer[1] == '\n' ) ...it's a return, do whatever...

Quzah.

i've been using the logic you showed but i think my declarations may be incorrect.

char input[50]; //read from keyboard


then when i try to reference this by input[4] i get an error from the compiler saying that int converions from pointer or something like that.

so can i convert this input[50] to an array. i figured it is an array since a string is an array of chars right?

Here, learn from this example:

Code:

---

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main ( void )
{
        char myArray[50];

        printf( "Enter a string of up to 49 characters:\n" );
        fgets( myArray, 50, stdin );

        printf("The first character in the array is: '%c'.\n", myArray[0] );
        printf("The second character in the array is: '%c'.\n", myArray[1] );
        return 0;
}


Quzah.

---

thank you SOOOOOOOOOOOO much.

thats what i was looking for! i've been looking for a tutorial on this all day!

now i can get on with the hard part of the assignment.

doubly linked lists!!!

well i spoke to soon! same warning message!!! then when i compile i get a segmenation fault here's my exact code.

#include <stdio.h>
#include <string.h>

int main(void)
{
char userInput[50];

printf("\nPrompt >> ");
fgets(userInput, 50, stdin);

printf("%c", userInput[0]);
printf("\n");

return 0;
}

What compiler are you using? There's nothing wrong with your code.

Quzah.

well i'm on a windows machine right now connected to a sun server using the gcc compiler

ttt