How to calculate # of characters in a string

[gemni7]

I need to write a small program about how to calculate number of characters in a string. I am getting a string from com port after every 15 second which also contains (*, @ $) symbols besides alphabets including spaces. Can anyone give me idea how to accomplish this task.

[horace1]

I need to write a small program about how to calculate number of characters in a string. I am getting a string from com port after every 15 second which also contains (*, @ $) symbols besides alphabets including spaces. Can anyone give me idea how to accomplish this task.

If you can read the serial COM: port character by character you just check each characters as it is read. Otherwise if you read it as a string (e.g. into a char array) you would need to go thru the array after each read.
What operating system/compiler are you using?

[gemni7]

I am using borland 5.5 w XP
can u please give me any example or code so that I can understand the concept and write one. I thank you in advance

[horace1]

I am using borland 5.5 w XP
can u please give me any example or code so that I can understand the concept and write one. I thank you in advance

does you borland complier have the functions to read from the COM: ports?

[gemni7]

Yes I have that

[horace1]

Yes I have that

write a program to open the COM: port (setting baud rate, data bits, stop bits, etc) and attempt to read characters from it and display them on the screen. Once that is working you can start checking the characters

for example if you have a function rs_initialise() which initialises the port and a function rs_getch() which reads a character from the port the code would look something like

    rs_initialise("com1" ,57600, '8', 'N');
    char letter;
    while(1)
     {
      letter=rs_getch(port);
      putchar(letter);
      }