how do I change the case of a string?

This is a discussion on how do I change the case of a string? within the C Programming forums, part of the General Programming Boards category; I need to create a program for my friend that accepts a string from the user (not from the command ...

  1. #1
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    how do I change the case of a string?

    I need to create a program for my friend that accepts a string from the user (not from the command line) and displays:

    -The string using upper-case letters, e.g. all lower-case letters are converted to upper-case letters

    -The string using lower-case letters, e.g. all upper-case letters are converted to lower-case letter.

    -The string where the first letter of each word is upper-case and all other letters in the word are lower-case.

    -The string in "camel case", i.e. the first letter in the string is lower case, followed by alternating upper and lower case letters.

    -And that's it :P

    Hereís what I have so far, I'm completely lost now :*( if anyone could help me finish this I'd greatly appreciate it. )) also I don't want to use string commands, too easy :P I figured I'd post the entire working code so you can see whatís wrong. I've been trying to get Lower case to work, but every way I use it, it just messes up the rest of them. I want it to display the sentence you entered, then in lowercase, then in uppercase, then in first case, then in camel case. I got the sentence, upper and first case to work. The other two I canít. Please see if you can fix it, I feel retarded lol....

    Code:
    #include <stdio.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <ctype.h>
    
    void toUpper(char *str);
    void toFirstCap(char *str);
    void toCamelCase(char *str);
    
    int main(int argc, char **argv)
    { 
    char sentence[256]; 
    char ch; int i = 0;
    printf("Enter a string: ");
    gets(sentence);
    printf("\nYour Sentence:%s\n",sentence);
    toUpper(sentence);
    printf("\nUpper case: %s\n",sentence);
    toFirstCap(sentence);
    printf("\nFirstCap case: %s\n",sentence);
    toFirstCap(sentence);
    system("pause");}
    
    void toUpper(char *str){
    while(*str != '\0'){
    if(*str >= 'a' && *str <= 'z')
    { *str -= 'd' - 'D';
    } str++; }}
    
    void chngCaseSingleCharacter(char *str, int cAse){
    if(cAse == 2)
    { 
    if(*str >= 'a' && *str <= 'z'){
    *str -= 'd' - 'D';}
    else if(cAse == 1){
    if(*str >= 'A' && *str <= 'Z'){ 
    *str += 'd' - 'D';
    }}}}
    
    void toFirstCap(char *str){
    char b;
    while( (b = *str++) != '\0'){ 
    if(b == ' ' || b == '\t'){
    if(*str >= 'a' && *str <= 'z')
    { *str -= 'd' - 'D'; }} 
    else{
    if(*str >= 'A' && *str <= 'Z') {
    *str += 'd' - 'D'; }}}}
    
    void toFirstCapSmartWay(char *str){
    char b; while( (b = *str++) != '\0') 
    { if(b == ' ' || b == '\t') {
    chngCaseSingleCharacter(str, 2);}
    else {
    chngCaseSingleCharacter(str, 1);
    }}}
    
    //void toCamelCase(char *str)
    //put code 4 camel case here//

  2. #2
    {Jaxom,Imriel,Liam}'s Dad Kennedy's Avatar
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    Start by INDENTING!!!

    After that, loop through each string and compare each char ch for 'a' <= ch <= 'z', and if it is, subtract 'a' and add 'A' to it.

    That would be the way for upstring.

    Really, though. You need to learn to indent. That is really ugly up there.

  3. #3
    and the hat of sweating
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    Quote Originally Posted by eligilbert12 View Post
    I need to create a program for my friend that accepts a string from the user (not from the command line) and displays:

    -The string using upper-case letters, e.g. all lower-case letters are converted to upper-case letters

    -The string using lower-case letters, e.g. all upper-case letters are converted to lower-case letter.

    -The string where the first letter of each word is upper-case and all other letters in the word are lower-case.

    -The string in "camel case", i.e. the first letter in the string is lower case, followed by alternating upper and lower case letters.

    -And that's it :P

    Hereís what I have so far, I'm completely lost now :*( if anyone could help me finish this I'd greatly appreciate it. )) also I don't want to use string commands, too easy :P
    Hopefully your friend tries running it on a mainframe and sees your program fail miserably. Changing case the way you're doing it is not portable.
    "I am probably the laziest programmer on the planet, a fact with which anyone who has ever seen my code will agree." - esbo, 11/15/2008

    "the internet is a scary place to be thats why i dont use it much." - billet, 03/17/2010

  4. #4
    eh ya hoser, got a beer? stumon's Avatar
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    All you need to do, is run through the string. Find the spaces and remove those elements of the char array, then just turn the next character ToUpper.
    The keyboard is the standard device used to cause computer errors!

  5. #5
    and the hat of int overfl Salem's Avatar
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    Continued - Camel Case!!!!
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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